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Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
Pay vs Performance Disclosure
Net income	$ 122,773	$ 76,884

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

EMPLOYEE STOCK PLANS - Summary of Compensation Expense for Stock-Based Awards (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Restricted stock units and awards	$ 4,859	$ 1,351
Performance share units	780	1,287
Total stock-based compensation expense	$ 5,639	$ 2,638

COMMITMENTS AND CONTINGENCIES - Legal Proceedings (Narrative) (Details) $ in Millions			3 Months Ended
	Mar. 12, 2024 USD ($)	Dec. 19, 2016 USD ($)	Mar. 31, 2025 claim defendant
CBIZ Operations and a former employee of CBIZ MMP
Commitments And Contingencies [Line Items]
Total transaction price		$ 200.0
Litigation settlement, amount awarded	$ 3.1
CBIZ Operations and a former employee of CBIZ MMP \| Maximum
Commitments And Contingencies [Line Items]
Amount of damages sought (up to)		$ 177.0
MOVEit Customer Data Security Breach Litigation
Commitments And Contingencies [Line Items]
Number of claims filed \| claim			180
Number of defendants \| defendant			100

COMMITMENTS AND CONTINGENCIES	3 Months Ended
COMMITMENTS AND CONTINGENCIES	Mar. 31, 2025
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Letters of Credit and Guarantees - We provide letters of credit to landlords (lessors) of our leased premises in lieu of cash security deposits, which totaled $3.2 million and $3.2 million at March 31, 2025 and December 31, 2024, respectively. In addition, we provide license bonds to various state agencies to meet certain licensing requirements. The amount of license bonds outstanding was $2.2 million and $2.2 million at March 31, 2025 and December 31, 2024, respectively. Legal Proceedings - On December 19, 2016, CBIZ Operations, Inc. ("CBIZ Operations") was named as a defendant in a lawsuit filed by Zotec Partners, LLC (“Zotec”) in the Marion County Indiana Superior Court. After various amendments, the lawsuit asserted claims under Indiana law for securities, statutory and common law fraud or deception, unjust enrichment, breach of contract, and vicarious liability against CBIZ Operations and a former employee of CBIZ MMP in connection with the sale of the CBIZ MMP medical billing practice to Zotec. The plaintiff claimed that CBIZ Operations had a duty to disclose the fact, unknown to employees of CBIZ Operations at the time of the transaction, that the former employee had a financial arrangement with a Zotec vendor at the time CBIZ Operations sold CBIZ MMP to Zotec. The plaintiff sought damages of up to $177.0 million out of the $200.0 million transaction price. Trial was held in October 2021. The jury found in favor of CBIZ on all fraud, contract and other claims before it. On November 14, 2022, the trial court ruled in favor of CBIZ and against Zotec’s claim for statutory securities fraud. The court also ruled in favor of CBIZ on its counterclaim for indemnification under contract. The trial court conducted a hearing on December 12, 2023, to consider evidence regarding the amount of damages owed by Zotec to CBIZ on the counterclaim. On March 12, 2024, the court awarded CBIZ $3.1 million on its counterclaim. On April 10, 2024, Zotec filed a notice of appeal. On April 8, 2025, the Court of Appeals affirmed the trial court's dismissal of the securities fraud claim against CBIZ. The Court of Appeals reversed the award to CBIZ on its counterclaim. On November 10, 2023, CBIZ was named as a defendant in a putative class action lawsuit in the United States District Court for the District of Massachusetts by an individual claiming to be an employee of a CBIZ client whose personally identifiable information (“PII”) was compromised and stolen during a cyberattack CBIZ experienced on or about May 31, 2023. As a result of this incident, hackers were able to access and download certain files from CBIZ’s MOVEit Transfer server. The lawsuit alleges that CBIZ and Progress Software Corporation, the owner of MOVEit Transfer, failed to adequately secure and safeguard the individual’s, and similarly situated employees of CBIZ’s clients, PII from unauthorized access. The lawsuit seeks various remedies, including actual, compensatory, and punitive damages, along with injunctive relief, costs, and attorneys’ fees. On December 8, 2023, CBIZ was named as a defendant in a second putative class action lawsuit in the United States District Court for the District of Massachusetts by an individual making similar claims and seeking similar remedies as in the first lawsuit regarding the cyberattack CBIZ experienced on or about May 31, 2023. Both cases were transferred into a multidistrict litigation, styled as In Re: MOVEit Customer Data Security Breach Litigation, pending in the United States District Court for the District of Massachusetts (the “MDL”). To date, the MDL has over 180 cases against over 100 different defendants, all with claims arising out of the cyberbreach by hackers of Progress Software Corporation’s MOVEit Transfer software. The cases in the MDL, including the cases against CBIZ, are in their earliest stages, with a stay in place until the MDL Court issues a scheduling order. Due to the early stage of litigation, the Company is not able to determine or predict the ultimate outcome of these lawsuits nor reasonably provide an estimate or range of the possible outcome or losses, if any. In addition to the items disclosed above, the Company is, from time to time, subject to claims and lawsuits arising in the ordinary course of business. We cannot predict the outcome of all such matters or estimate the possible loss, if any. Although the proceedings are subject to uncertainties in the litigation process and the ultimate disposition of these proceedings is not presently determinable, we intend to vigorously defend these matters. Refer to the Annual Report on Form 10-K for the year ended December 31, 2024 for further discussion on the Company's commitments and contingencies.

OTHER COMPREHENSIVE INCOME (Tables)

3 Months Ended

Mar. 31, 2025

Equity [Abstract]

Summary of Other Comprehensive (Loss) Income and Tax Impact

The following table is a summary of other comprehensive income and discloses the tax impact of each component of other comprehensive (loss) income for the three months ended March 31, 2025 and 2024 (in thousands):


	Three Months Ended March 31,
	2025		2024
Net unrealized gain on available-for-sale securities, net of taxes(1)	$	72	$	56
Net unrealized (loss) gain on interest rate swaps, net of taxes(2)	(1,301)		960
Foreign currency translation	(6)		2
Total other comprehensive (loss) income, net of tax	$	(1,235)	$	1,018

(1)Net of income tax expense of $29 and $21 for the three months ended March 31, 2025 and 2024, respectively.

(2)Net of income tax benefit of $434 and income tax expense of $322 for the three months ended March 31, 2025 and 2024, respectively.

SEGMENT DISCLOSURES - Additional Information (Details)	3 Months Ended
SEGMENT DISCLOSURES - Additional Information (Details)	Mar. 31, 2025 segment
Segment Reporting [Abstract]
Number of business units of the company	3

EMPLOYEE STOCK PLANS - Summary of Performance Share Units Activity (Details) - Performance share units shares in Thousands	3 Months Ended
	Mar. 31, 2025 $ / shares shares
Performance Share Units
Outstanding at beginning of period (in shares) \| shares	285
Granted (in shares) \| shares	81
Vested (in shares) \| shares	(124)
Adjustments for performance results (in shares) \| shares	(3)
Outstanding at end of period (in shares) \| shares	239
Weighted Average Grant-Date Fair Value Per Unit
Outstanding at beginning of period (in dollars per share) \| $ / shares	$ 48.18
Granted (in dollars per share) \| $ / shares	84.67
Vested (in dollars per share) \| $ / shares	38.12
Adjustments for performance results (in dollars per share) \| $ / shares	38.12
Outstanding at end of period (in dollars per share) \| $ / shares	$ 65.80

ACCOUNTS RECEIVABLE, NET - Summary of Changes to the Allowance for Doubtful Accounts on Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ (31,715)	$ (25,598)
Provision	(10,748)	(19,979)
Charge-offs, net of recoveries	(1,166)	13,862
Allowance for doubtful accounts	$ (43,629)	$ (31,715)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	Mar. 31, 2025 practice_group
Accounting Policies [Abstract]
Number of practice groups	3

FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2025

Investments, All Other Investments [Abstract]

Summary of Activities Related to Investments

The following table summarizes activities related to these investments for the three months ended March 31, 2025 and the year ended December 31, 2024 (in thousands):


	Three Months Ended March 31, 2025		Year Ended December 31, 2024
Fair value at beginning of period	$	40,999	$	39,459
Purchases	8,300		23,210
Redemptions	(1,400)		(500)
Maturities	(7,010)		(21,423)
Change in bond premium	90		(386)
Fair market value adjustment	102		639
Fair value at end of period	$	41,081	$	40,999

Summary of Outstanding Interest Rate Swaps

The following table summarizes our outstanding interest rate swaps and their classification in the accompanying unaudited Condensed Consolidated Balance Sheets at March 31, 2025 and December 31, 2024 (amounts in thousands):


	March 31, 2025
	Notional Amount		Fixed Rate		Expiration	Fair Value		Balance Sheet Location
Interest rate swap	$	50,000	0.834	%	4/14/2025	$	67	Other current asset
Interest rate swap	$	30,000	1.186	%	12/14/2026	$	1,266	Other non-current asset
Interest rate swap	$	20,000	2.450	%	8/14/2027	$	549	Other non-current asset
Interest rate swap	$	25,000	3.669	%	4/14/2028	$	(37)	Other non-current liability
Interest rate swap	$	25,000	4.488	%	10/14/2028	$	(710)	Other non-current liability
Interest rate swap (1)	$	50,000	3.703	%	3/14/2030	$	(189)	Other non-current liability

(1)Entered into during the first quarter of 2025.


	December 31, 2024
	Notional Amount		Fixed Rate		Expiration	Fair Value		Balance Sheet Location
Interest rate swap	$	50,000	0.834	%	4/14/2025	$	495	Other current asset
Interest rate swap	$	30,000	1.186	%	12/14/2026	$	1,604	Other non-current asset
Interest rate swap	$	20,000	2.450	%	8/14/2027	$	776	Other non-current asset
Interest rate swap	$	25,000	3.669	%	4/14/2028	$	243	Other non-current asset
Interest rate swap	$	25,000	4.488	%	10/14/2028	$	(437)	Other non-current liability

Summary of Effects of Interest Rate Swap

The following table summarizes the effects of the interest rate swaps on the accompanying unaudited Condensed Consolidated Statements of Comprehensive Income for the three months ended March 31, 2025 and 2024 (in thousands):


	Gain (Loss) Recognized in AOCI, net of tax				Gain Reclassified from AOCI into Expense
	Three Months Ended March 31,				Three Months Ended March 31,
	2025		2024		2025		2024
Interest rate swaps	$	(717)	$	1,854	$	779	$	1,191

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

+ Details

OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Equity [Abstract]
Net unrealized gain on available-for-sale securities, net of taxes	$ 72	$ 56
Net unrealized (loss) gain on interest rate swaps, net of taxes	(1,301)	960
Foreign currency translation	(6)	2
Total other comprehensive (loss) income, net of tax	(1,235)	1,018
Unrealized gain (loss) on available-for-sale securities, income tax expense	29	21
Unrealized gain (loss) on interest rate swaps, income tax expense (benefit)	$ (434)	$ 322

OTHER COMPREHENSIVE INCOME

3 Months Ended

Mar. 31, 2025

Equity [Abstract]

OTHER COMPREHENSIVE INCOME


	Three Months Ended March 31,
	2025		2024
Net unrealized gain on available-for-sale securities, net of taxes(1)	$	72	$	56
Net unrealized (loss) gain on interest rate swaps, net of taxes(2)	(1,301)		960
Foreign currency translation	(6)		2
Total other comprehensive (loss) income, net of tax	$	(1,235)	$	1,018

(1)Net of income tax expense of $29 and $21 for the three months ended March 31, 2025 and 2024, respectively.

(2)Net of income tax benefit of $434 and income tax expense of $322 for the three months ended March 31, 2025 and 2024, respectively.

NEW ACCOUNTING PRONOUNCEMENTS	3 Months Ended
NEW ACCOUNTING PRONOUNCEMENTS	Mar. 31, 2025
Accounting Changes and Error Corrections [Abstract]
NEW ACCOUNTING PRONOUNCEMENTS	NEW ACCOUNTING PRONOUNCEMENTSThe FASB ASC is the sole source of authoritative GAAP other than the SEC issued rules and regulations that apply only to SEC registrants. The FASB issues an ASU to communicate changes to the FASB ASC. We assess and review the impact of all issued ASUs. During the three months ended March 31, 2025, we have implemented all new ASUs that are in effect and that may impact our consolidated financial statements.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Section 65
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476176/805-60-65-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Section 65
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483550/848-10-65-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 65
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-Subparagraph (h)(2)
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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-Name Accounting Standards Codification
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-Paragraph 5
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 65
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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Reference 20: http://www.xbrl.org/2003/role/disclosureRef
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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
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Reference 25: http://www.xbrl.org/2003/role/disclosureRef
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Reference 26: http://www.xbrl.org/2003/role/disclosureRef
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Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
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Reference 28: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (e)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480175/815-40-65-1

+ Details

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Restricted stock units and awards	Performance share units	Common Stock	Common Stock Restricted stock units and awards	Common Stock Performance share units	Treasury Shares	Additional Paid-In Capital	Additional Paid-In Capital Restricted stock units and awards	Additional Paid-In Capital Performance share units	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Common stock, beginning balance (in shares) at Dec. 31, 2023				137,387
Treasury stock, beginning balance (in shares) at Dec. 31, 2023							87,573
Beginning balance at Dec. 31, 2023	$ 791,618			$ 1,374			$ (899,093)	$ 832,475			$ 855,084	$ 1,778
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	76,884										76,884
Other comprehensive income (loss), net of tax	1,018											1,018
Indirect repurchase of shares for minimum tax withholding (in shares)							170
Indirect repurchase of shares for minimum tax withholding	(11,229)						$ (11,229)
Restricted stock units and awards and performance share units (in shares)					102	273
Restricted stock units and awards and performance share units		$ 0	$ 0		$ 1	$ 3			$ (1)	$ (3)
Stock-based compensation	2,638							2,638
Business acquisitions (in shares)				93
Business acquisitions	6,160			$ 1				6,159
Common stock, ending balance (in shares) at Mar. 31, 2024				137,855
Treasury stock, ending balance (in shares) at Mar. 31, 2024							87,743
Ending balance at Mar. 31, 2024	867,089			$ 1,379			$ (910,322)	841,268			931,968	2,796
Common stock, beginning balance (in shares) at Dec. 31, 2024				137,945
Treasury stock, beginning balance (in shares) at Dec. 31, 2024							87,747
Beginning balance at Dec. 31, 2024	1,779,983			$ 1,380			$ (910,601)	1,791,863			896,122	1,219
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	122,773										122,773
Other comprehensive income (loss), net of tax	(1,235)											(1,235)
Indirect repurchase of shares for minimum tax withholding (in shares)							88
Indirect repurchase of shares for minimum tax withholding	(7,726)						$ (7,726)
Restricted stock units and awards and performance share units (in shares)			124		78
Restricted stock units and awards and performance share units		$ 0	$ 0		$ 1	$ 1			$ (1)	$ (1)
Stock-based compensation	5,639							5,639
Business acquisitions (in shares)				3,777
Business acquisitions	15,267			$ 38				15,229
Common stock, ending balance (in shares) at Mar. 31, 2025				141,924
Treasury stock, ending balance (in shares) at Mar. 31, 2025							87,835
Ending balance at Mar. 31, 2025	$ 1,914,701			$ 1,420			$ (918,327)	$ 1,812,729			$ 1,018,895	$ (16)

FINANCIAL INSTRUMENTS - Summary of Outstanding Interest Rate Swaps (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Interest Rate Swap, April 2025 Expiration \| Other current asset
Derivatives, Fair Value [Line Items]
Notional amount, asset	$ 50,000	$ 50,000
Interest rate swap, fixed interest rate	0.834%	0.834%
Fair value, asset	$ 67	$ 495
Interest Rate Swap, December 2026 Expiration \| Other non-current asset
Derivatives, Fair Value [Line Items]
Notional amount, asset	$ 30,000	$ 30,000
Interest rate swap, fixed interest rate	1.186%	1.186%
Fair value, asset	$ 1,266	$ 1,604
Interest Rate Swap, August 2027 Expiration \| Other non-current asset
Derivatives, Fair Value [Line Items]
Notional amount, asset	$ 20,000	$ 20,000
Interest rate swap, fixed interest rate	2.45%	2.45%
Fair value, asset	$ 549	$ 776
Interest Rate Swap, April 2028 Expiration \| Other non-current asset
Derivatives, Fair Value [Line Items]
Notional amount, asset		$ 25,000
Interest rate swap, fixed interest rate		3.669%
Fair value, asset		$ 243
Interest Rate Swap, April 2028 Expiration \| Other non-current liability
Derivatives, Fair Value [Line Items]
Notional amount, liability	$ 25,000
Interest rate swap, fixed interest rate	3.669%
Fair value, liability	$ (37)
Interest Rate Swap, October 2028 Expiration \| Other non-current liability
Derivatives, Fair Value [Line Items]
Notional amount, liability	$ 25,000	$ 25,000
Interest rate swap, fixed interest rate	4.488%	4.488%
Fair value, liability	$ (710)	$ (437)
Interest Rate Swap, March 2030 Expiration \| Other non-current liability
Derivatives, Fair Value [Line Items]
Notional amount, liability	$ 50,000
Interest rate swap, fixed interest rate	3.703%
Fair value, liability	$ (189)

ACCOUNTS RECEIVABLE, NET (Tables)

3 Months Ended

Mar. 31, 2025

Receivables [Abstract]

Summary of Accounts Receivable, Net

Accounts receivable, net, at March 31, 2025 and December 31, 2024 was as follows (in thousands):


	March 31, 2025		December 31, 2024
Trade accounts receivable	$	488,607	$	416,211
Unbilled revenue, at net realizable value	290,448		150,362
Total accounts receivable	779,055		566,573
Allowance for doubtful accounts	(43,629)		(31,715)
Accounts receivable, net	$	735,426	$	534,858

Summary of Changes to the Allowance for Doubtful Accounts on Accounts Receivable

Changes to the allowance for doubtful accounts for the three months ended March 31, 2025 and year ended December 31, 2024 were as follows (in thousands):


	March 31, 2025		December 31, 2024
Balance at beginning of period	$	(31,715)	$	(25,598)
Provision	(10,748)		(19,979)
Charge-offs, net of recoveries	(1,166)		13,862
Allowance for doubtful accounts	$	(43,629)	$	(31,715)

FAIR VALUE MEASUREMENTS - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets of deferred compensation plan	$ 162,066	$ 167,170
Available-for-sale debt securities	41,081	40,999	$ 39,459
Deferred compensation plan obligations	(162,066)	(167,170)
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets of deferred compensation plan	162,066	167,170
Available-for-sale debt securities	41,081	40,999
Other depository assets	177	176
Deferred compensation plan obligations	(162,066)	(167,170)
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	946	2,681
Bank debt	(1,528,730)	(1,399,932)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent purchase price liabilities	$ (65,963)	$ (96,967)

FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Par value of available-for-sale debt securities	$ 41,000	$ 41,300
Funds held for clients	140,932	175,853
Certified Deposits and Other Depository Assets
Debt Securities, Available-for-sale [Line Items]
Funds held for clients	$ 200	$ 200

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
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-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
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-Section 50
-Paragraph 3
-Subparagraph (b)
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

+ Details

SEGMENT DISCLOSURES (Tables)

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

Summary of Segment Information

Segment information for the three months ended March 31, 2025 and 2024 was as follows (in thousands):


	Three months ended March 31, 2025
	Financial Services		Benefits and Insurance Services		National Practices		Total
Revenue from external customers	$	713,661	$	112,976	$	11,377	$	838,014

Significant expenses:
Personnel costs	411,302		66,665		10,155		488,122
Facility costs	23,710		3,208		2		26,920
Other costs, gains, and losses, net (1)	75,296		15,158		108		90,562
Total segment expense	510,308		85,031		10,265		605,604
Segment income before income tax expenses	203,353		27,945		1,112		232,410

Corporate & other:
Unallocated corporate operating expenses							3,797
General & administrative expenses							28,070
Interest expense							25,156
Other expense, net							2,477
Consolidated income before income tax expenses							$	172,910


	Three Months Ended March 31, 2024
	Financial Services		Benefits and Insurance Services		National Practices		Total
Revenue from external customers	$	372,630	$	108,408	$	13,259	$	494,297

Significant expenses:
Personnel costs	216,615		65,723		11,422		293,760
Facility costs	12,335		3,182		63		15,580
Other costs, gains, and losses, net (1)	36,525		14,688		448		51,661
Total segment expense	265,475		83,593		11,933		361,001
Segment income before income tax expenses	107,155		24,815		1,326		133,296

Corporate & other:
Unallocated corporate operating expenses							15,354
General & administrative expenses							18,711
Interest expense							4,511
Other income, net							(9,294)
Consolidated income before income tax expenses							$	104,014

(1)Other costs, gains, and losses, net primarily consist of travel and entertainment costs, computer and technology related costs, depreciation and amortization expenses, and other discretionary costs.

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net Income	$ 122,773	$ 76,884
Basic
Weighted average common shares outstanding (in shares)	63,843	50,045
Diluted
Stock options (in shares)	84	74
Restricted stock units and awards (in shares)	215	99
Contingent shares (in shares)	0	3
Diluted weighted average common shares outstanding (in shares)	64,142	50,221
Basic earnings per share (in dollars per share)	$ 1.92	$ 1.54
Diluted earnings per share (in dollars per share)	$ 1.91	$ 1.53
Share-based Payment Arrangement
Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Share based awards excluded from the calculation of diluted earnings per share (in shares)	44	40
PSU
Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Share based awards excluded from the calculation of diluted earnings per share (in shares)	239	254

FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2025

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

The following table summarizes our assets and (liabilities) at March 31, 2025 and December 31, 2024, respectively, that are measured at fair value on a recurring basis subsequent to initial recognition and indicates the fair value hierarchy of the valuation techniques utilized by us to determine such fair value (in thousands):


	Level	March 31, 2025		December 31, 2024
Assets of deferred compensation plan	1	$	162,066	$	167,170
Available-for-sale debt securities	1	41,081		40,999
Other depository assets	1	177		176
Deferred compensation plan obligations	1	(162,066)		(167,170)
Interest rate swaps	2	946		2,681
Bank debt	2	(1,528,730)		(1,399,932)
Contingent purchase price liabilities	3	(65,963)		(96,967)

During the three months ended March 31, 2025 and 2024, there were no transfers between the valuation hierarchy Levels 1, 2 and 3.

The following table summarizes the change in Level 3 fair values of our contingent purchase price liabilities for the three months ended March 31, 2025 and 2024 (pre-tax basis, in thousands):


	2025		2024
Beginning balance – December 31	$	(96,967)	$	(114,946)
Additions from business acquisitions	(757)		(13,522)

Settlement of contingent purchase price liabilities	32,228		34,716
Change in fair value of contingencies	170		70
Change in net present value of contingencies	(637)		(504)
Ending balance – March 31	$	(65,963)	$	(94,186)

The following table summarizes the changes in contingent purchase price consideration for previous acquisitions and contingent payments made for previous business acquisitions in the three months ended March 31, 2025 and 2024, respectively (in thousands):


	Three Months Ended March 31,
	2025		2024
Net expense	$	467	$	434
Cash settlement paid	$	29,520	$	30,957
Shares issued (number)	33		60

Refer to the Annual Report on Form 10-K for the year ended December 31, 2024 for further discussion on the fair value measurements and classification of our financial assets and liabilities.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Mar. 31, 2025
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Selected Terms Used in Notes to the Condensed Consolidated Financial Statements ASA – Administrative Service Agreement ASC – Accounting Standards Codification ASU – Accounting Standards Update CPA firm – Certified Public Accounting firm FASB – The Financial Accounting Standards Board GAAP – United States Generally Accepted Accounting Principles SOFR – Secured Overnight Financing Rate SEC – United States Securities and Exchange Commission Marcum Acquisition - the Transaction Description of Business: CBIZ, Inc., together with all of its wholly-owned subsidiaries ("CBIZ", the "Company", "we", "us", or "our"), is a diversified services company which, acting through its subsidiaries, has been providing professional business services since 1996, primarily to small and medium-sized businesses, as well as individuals, governmental entities, and not-for-profit enterprises throughout the United States and parts of Canada. CBIZ, Inc. manages and reports its operations along three practice groups: Financial Services, Benefits and Insurance Services and National Practices. A further description of products and services offered by each of the practice groups is provided in Note 12, Segment Disclosures. In December of 2024, the Company formed CBIZ CC, LLC and CBIZ Campus One Cell, LLC (collectively “Captive Insurance Company”). CBIZ CC, LLC, a sponsored captive core, is not expected to have any underwriting activities. CBIZ Campus One Cell, LLC, a sponsored captive cell, provides stop-loss coverages to a group of higher education institutions who self-insure their medical and prescription drug benefits. The term of the insurance policy is one year, and the insured is billed at the beginning of each month for that month’s coverage. Registered in the State of Vermont, the Captive Insurance Company commenced operation on January 1, 2025. The Captive Insurance Company recognizes premium as revenue monthly as monthly coverage expires. For the three months ended March 31, 2025, revenue from the Captive Insurance Company was not material. Basis of Consolidation: The accompanying unaudited condensed consolidated financial statements include the operations of CBIZ, Inc. and all of its wholly-owned subsidiaries after elimination of all intercompany balances and transactions. We have determined that our relationship with certain CPA firms with which we maintain ASAs qualify as variable interest entities ("VIEs"), and we are the primary beneficiary of such VIE. The accompanying unaudited condensed consolidated financial statements do not reflect the operations or accounts of the VIEs as the impact is not material to the financial condition, results of operations, or cash flows of CBIZ. Unaudited Interim Financial Statements: The unaudited condensed consolidated financial statements have been prepared in accordance with GAAP and applicable rules and regulations of the SEC regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2024. In the opinion of CBIZ management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial condition, results of operations, and cash flows for the interim periods presented, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2025. Use of Estimates: The preparation of unaudited condensed consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Changes in circumstances could cause actual results to differ materially from these estimates. Changes in Accounting Policies: We have consistently applied the accounting policies for the periods presented as described in Note 1, Basis of Presentation and Significant Accounting Policies, to the consolidated financial statements contained in our Annual Report on Form 10-K for the year ended December 31, 2024. Certain prior period amounts have been reclassified to conform to current year presentation.

COVER - shares	3 Months Ended
COVER - shares	Mar. 31, 2025	Apr. 21, 2025
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2025
Document Transition Report	false
Entity File Number	1-32961
Entity Registrant Name	CBIZ, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-2769024
Entity Address, Address Line One	5959 Rockside Woods
Entity Address, Address Line Two	N. Suite 600
Entity Address, City or Town	Independence
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44131
City Area Code	216
Local Phone Number	447-9000
Title of 12(b) Security	Common Stock, $0.01 Par Value
Trading Symbol	CBZ
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		54,395,610
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000944148
Current Fiscal Year End Date	--12-31

DEBT AND FINANCING ARRANGEMENTS - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Interest expense	$ 25,156,000	$ 4,511,000
Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	20,000,000.0
Outstanding line of credit	0		$ 0
2024 Credit Facilities
Debt Instrument [Line Items]
Available funds under credit facility	384,000,000
2024 Credit Facilities \| Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2,000,000,000.0
Annual amortization rate first two years	5.00%
Annual amortization rate third and fourth years	7.50%
Annual amortization rate, year five	10.00%
Covenant leverage ratio, maximum, tranche one	5.00
Covenant leverage ratio, maximum, tranche two	3.75
Covenant interest coverage ratio, minimum	3.00
2024 Credit Facilities \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,400,000,000
2024 Credit Facilities \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600,000,000.0

SEGMENT DISCLOSURES

3 Months Ended

Mar. 31, 2025

Segment Reporting [Abstract]

SEGMENT DISCLOSURES

Our business units have been aggregated into three practice groups: Financial Services, Benefits and Insurance Services, and National Practices. The business units have been aggregated based on the following factors: similarity of the products and services provided to clients; similarity of the regulatory environment in which they operate; and similarity of economic conditions affecting long-term performance. The business units are managed along these segment lines. Refer to the Annual Report on Form 10-K for the year ended December 31, 2024 for further discussion on the segment lines.

Corporate and Other - Included in Corporate and Other are operating expenses that are not directly allocated to the individual business units. These expenses primarily consist of certain health care costs, gains or losses attributable to assets held in our non-qualified deferred compensation plan, stock-based compensation, consolidation and integration charges, certain professional fees, certain advertising costs, and other various expenses.

Accounting policies of the practice groups are the same as those described in Note 1, Basis of Presentation and Significant Accounting Policies, to the Annual Report on Form 10-K for the year ended December 31, 2024. Upon consolidation, intercompany accounts and transactions are eliminated, thus inter-segment revenue is not included in the measure of profit or loss for the practice groups. Performance of the practice groups is evaluated on income (loss) before income tax expense (benefit) excluding those costs listed above, which are reported in “Corporate and Other”.

The practice groups respective revenue and pre-tax income, significant segment expenses, and a reconciliation of segment profit or loss measure to the consolidated income before income tax expense for the three months ended March 31, 2025 and 2024 is presented below. We do not manage our assets on a segment basis, therefore segment assets are not presented below.

Segment information for the three months ended March 31, 2025 and 2024 was as follows (in thousands):


	Three months ended March 31, 2025
	Financial Services		Benefits and Insurance Services		National Practices		Total
Revenue from external customers	$	713,661	$	112,976	$	11,377	$	838,014

Significant expenses:
Personnel costs	411,302		66,665		10,155		488,122
Facility costs	23,710		3,208		2		26,920
Other costs, gains, and losses, net (1)	75,296		15,158		108		90,562
Total segment expense	510,308		85,031		10,265		605,604
Segment income before income tax expenses	203,353		27,945		1,112		232,410

Corporate & other:
Unallocated corporate operating expenses							3,797
General & administrative expenses							28,070
Interest expense							25,156
Other expense, net							2,477
Consolidated income before income tax expenses							$	172,910


	Three Months Ended March 31, 2024
	Financial Services		Benefits and Insurance Services		National Practices		Total
Revenue from external customers	$	372,630	$	108,408	$	13,259	$	494,297

Significant expenses:
Personnel costs	216,615		65,723		11,422		293,760
Facility costs	12,335		3,182		63		15,580
Other costs, gains, and losses, net (1)	36,525		14,688		448		51,661
Total segment expense	265,475		83,593		11,933		361,001
Segment income before income tax expenses	107,155		24,815		1,326		133,296

Corporate & other:
Unallocated corporate operating expenses							15,354
General & administrative expenses							18,711
Interest expense							4,511
Other income, net							(9,294)
Consolidated income before income tax expenses							$	104,014

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

BUSINESS COMBINATIONS

3 Months Ended

Mar. 31, 2025

Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]

BUSINESS COMBINATIONS

Acquisition of Marcum LLP

On November 1, 2024, the Company completed the acquisition of Marcum LLP (“Marcum”). The acquisition is referred to herein as the “Transaction”. During the three months ended March 31, 2025, the Company’s condensed consolidated statement of comprehensive income included $328.7 million of revenue and $86.5 million of operating income associated with the results of operations of Marcum.

Stock Consideration Transferred

At closing, the purchase price for the purpose of the Transaction consisted of an aggregate of $1,063.0 million of cash consideration and $934.7 million of the Company’s common stock, which represents a fair value of 13.6 million shares issued as stock consideration. Pursuant to the terms of the Transaction, with respect to the 13.6 million shares of stock consideration, approximately 4.0 million shares, in aggregate, were delivered from January 2, 2025 to April 1, 2025 to the selling shareholders. The remaining 9.6 million shares will be delivered in 32 monthly installments starting on May 1, 2025.

Measurement Period Adjustments

The Company applied the acquisition method of accounting in accordance with ASC 805, Business Combinations (“ASC 805”) and recognized assets acquired and liabilities assumed at their fair value as of the date of acquisition, with the excess purchase consideration recorded to goodwill. As the Company finalizes the estimation of the fair value of the assets acquired and liabilities assumed, additional adjustments may be recorded during the measurement period (a period not to exceed 12 months from the acquisition date).

During the three months ended March 31, 2025, the Company reassessed its estimates and inputs as new information about facts and circumstances that existed as of the acquisition date became known. As a result, the Company recorded a measurement period adjustment to reduce goodwill by $20.2 million, of which $21.0 million reflected a reduction of the estimated settlement amounts associated with an acquired liability from $61.0 million to $40.0 million, and $0.8 million reflected other immaterial adjustments related to assets and liabilities previously unrecognized. The acquired liability was previously reported as a component of other non-current liabilities and was reclassified to "other current liabilities" as of March 31, 2025 due to the estimated timing of settlement.

The following table summarizes the preliminary acquisition date fair value of net tangible and intangible assets acquired, net of liabilities assumed from Marcum, with the excess recorded as goodwill (in thousands):


	On November 1, 2024
	Fair Value
Total consideration transferred	$	1,997,781
Asset acquired:
Account receivable	169,866
Unbilled revenue	23,247
Other current assets	25,829
Property and equipment	31,221
Other intangible assets	490,000
Right-of- use asset	164,970
Deferred income taxes, net	3,485
Total identifiable asset acquired	908,618
Liabilities assumed:
Account payable	25,384
Accrued personnel costs	44,407
Other current liabilities	67,156
Contingent purchase price assumed (current and non-current)	25,042
Lease liabilities (current and non-current)	172,792
Other non-current liabilities	935
Total liabilities assumed	335,716
Net asset acquired	572,902
Goodwill	$	1,424,879

The preliminary purchase price allocation is subject to further refinement and may require adjustments to arrive at the final purchase price allocation. The above fair values of assets acquired and liabilities assumed are preliminary and are based on the information that was available as of the reporting date. The final determination of the fair value of certain assets and liabilities will be completed as soon as the necessary information, such as final working capital adjustments, becomes available but no later than one year from the acquisition date.

Refer to the Annual Report on Form 10-K for the year ended December 31, 2024 for further discussion of the Transaction.

ACCOUNTS RECEIVABLE, NET

3 Months Ended

Mar. 31, 2025

Receivables [Abstract]

ACCOUNTS RECEIVABLE, NET

Accounts receivable, less allowance for doubtful accounts, reflects the net realizable value of receivables and approximates fair value. Unbilled revenue is recorded at estimated net realizable value. Assessing the collectability of the receivables (billed and unbilled) requires management judgment based on a combination of factors, including but not limited to, an evaluation of our historical incurred loss experience, credit-worthiness of our clients, age of the trade receivable balance, current economic conditions that may affect a client’s ability to pay, and reasonable and supportable forecasts. Receivables are charged-off against the allowance when the balance is deemed uncollectible.

Accounts receivable, net, at March 31, 2025 and December 31, 2024 was as follows (in thousands):


	March 31, 2025		December 31, 2024
Trade accounts receivable	$	488,607	$	416,211
Unbilled revenue, at net realizable value	290,448		150,362
Total accounts receivable	779,055		566,573
Allowance for doubtful accounts	(43,629)		(31,715)
Accounts receivable, net	$	735,426	$	534,858

Changes to the allowance for doubtful accounts for the three months ended March 31, 2025 and year ended December 31, 2024 were as follows (in thousands):


	March 31, 2025		December 31, 2024
Balance at beginning of period	$	(31,715)	$	(25,598)
Provision	(10,748)		(19,979)
Charge-offs, net of recoveries	(1,166)		13,862
Allowance for doubtful accounts	$	(43,629)	$	(31,715)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Mar. 31, 2025
Accounting Policies [Abstract]
Description of Business	Description of Business: CBIZ, Inc., together with all of its wholly-owned subsidiaries ("CBIZ", the "Company", "we", "us", or "our"), is a diversified services company which, acting through its subsidiaries, has been providing professional business services since 1996, primarily to small and medium-sized businesses, as well as individuals, governmental entities, and not-for-profit enterprises throughout the United States and parts of Canada. CBIZ, Inc. manages and reports its operations along three practice groups: Financial Services, Benefits and Insurance Services and National Practices. A further description of products and services offered by each of the practice groups is provided in Note 12, Segment Disclosures. In December of 2024, the Company formed CBIZ CC, LLC and CBIZ Campus One Cell, LLC (collectively “Captive Insurance Company”). CBIZ CC, LLC, a sponsored captive core, is not expected to have any underwriting activities. CBIZ Campus One Cell, LLC, a sponsored captive cell, provides stop-loss coverages to a group of higher education institutions who self-insure their medical and prescription drug benefits. The term of the insurance policy is one year, and the insured is billed at the beginning of each month for that month’s coverage. Registered in the State of Vermont, the Captive Insurance Company commenced operation on January 1, 2025. The Captive Insurance Company recognizes premium as revenue monthly as monthly coverage expires. For the three months ended March 31, 2025, revenue from the Captive Insurance Company was not material.
Basis of Consolidation	Basis of Consolidation: The accompanying unaudited condensed consolidated financial statements include the operations of CBIZ, Inc. and all of its wholly-owned subsidiaries after elimination of all intercompany balances and transactions. We have determined that our relationship with certain CPA firms with which we maintain ASAs qualify as variable interest entities ("VIEs"), and we are the primary beneficiary of such VIE. The accompanying unaudited condensed consolidated financial statements do not reflect the operations or accounts of the VIEs as the impact is not material to the financial condition, results of operations, or cash flows of CBIZ.
Unaudited Interim Financial Statements	Unaudited Interim Financial Statements: The unaudited condensed consolidated financial statements have been prepared in accordance with GAAP and applicable rules and regulations of the SEC regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2024. In the opinion of CBIZ management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial condition, results of operations, and cash flows for the interim periods presented, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2025.
Use of Estimates	Use of Estimates: The preparation of unaudited condensed consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Changes in circumstances could cause actual results to differ materially from these estimates.
Changes in Accounting Policies	Changes in Accounting Policies: We have consistently applied the accounting policies for the periods presented as described in Note 1, Basis of Presentation and Significant Accounting Policies, to the consolidated financial statements contained in our Annual Report on Form 10-K for the year ended December 31, 2024. Certain prior period amounts have been reclassified to conform to current year presentation.
New Accounting Pronouncements	NEW ACCOUNTING PRONOUNCEMENTSThe FASB ASC is the sole source of authoritative GAAP other than the SEC issued rules and regulations that apply only to SEC registrants. The FASB issues an ASU to communicate changes to the FASB ASC. We assess and review the impact of all issued ASUs. During the three months ended March 31, 2025, we have implemented all new ASUs that are in effect and that may impact our consolidated financial statements.

EARNINGS PER SHARE

3 Months Ended

Mar. 31, 2025

Earnings Per Share [Abstract]

EARNINGS PER SHARE

The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2025 and 2024 (in thousands, except per share data):


	Three Months Ended March 31,
	2025		2024
Numerator:
Net Income	$	122,773	$	76,884
Denominator:
Basic
Weighted average common shares outstanding	63,843		50,045
Diluted
Stock options (1)	84		74
Restricted stock units and awards (1)	215		99

Contingent shares (2)	—		3
Diluted weighted average common shares outstanding (3)	64,142		50,221
Basic earnings per share	$	1.92	$	1.54
Diluted earnings per share	$	1.91	$	1.53

(1)A total of 44 thousand and 40 thousand shares of stock-based awards were excluded from the calculation of diluted earnings per share for three months ended March 31, 2025 and 2024, respectively, as their effect would be anti-dilutive.

(2)Contingent shares represent additional shares to be issued for purchase price earned by former owners of businesses acquired by us once future conditions have been met.

(3)The denominator used in calculating diluted earnings per share did not include 239 thousand and 254 thousand PSUs for both the three months ended March 31, 2025, and 2024, respectively. The performance conditions associated with these PSUs were not met and consequently none of these PSUs were considered as issuable for the three months ended March 31, 2025 and 2024.

COMMITMENTS AND CONTINGENCIES - Letters of Credit and Guarantees (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding	$ 3.2	$ 3.2
License bonds outstanding amount	$ 2.2	$ 2.2

EMPLOYEE STOCK PLANS

3 Months Ended

Mar. 31, 2025

Share-Based Payment Arrangement [Abstract]

EMPLOYEE STOCK PLANS

On May 10, 2023, the shareholders of the Company approved an amendment to the 2019 Stock Omnibus Incentive Plan (the “2019 Plan”). The amendment added 1.5 million shares to the total number of shares that may be issued under the 2019 Plan. All other aspects of the 2019 Plan remain unchanged. The 2019 Plan, which expires in 2029, permits the grant of various forms of stock-based awards. A maximum of 4.6 million stock options, restricted stock or other stock-based compensation awards may be granted. The terms and vesting schedules for the stock-based awards vary by type and date of grant. Shares subject to award under the 2019 Plan may be either authorized but unissued shares of our common stock or treasury shares. Refer to the Annual Report on Form 10-K for the year ended December 31, 2024 for further discussion on the 2019 Plan.

Compensation expense for stock-based awards recognized during the three months ended March 31, 2025 and 2024 was as follows (in thousands):


	Three Months Ended March 31,
	2025		2024

Restricted stock units and awards	$	4,859	$	1,351
Performance share units	780		1,287
Total stock-based compensation expense	$	5,639	$	2,638

Stock Options and Restricted Stock Units and Awards – The Company did not grant any stock options, nor were any stock options exercised during the three months ended March 31, 2025. As of March 31, 2025, we have 150 thousand stock options outstanding with a weighted average exercise price per share of $35.22.

The following table presents our restricted stock units and awards activity during the three months ended March 31, 2025 (in thousands, except per share data):


	Restricted Stock Units and Awards
		Number of Shares	Weighted Average Grant-Date Fair Value (1)
Outstanding at beginning of year		899	$	67.01
Granted		111	$	81.64
Exercised or released		(78)	$	49.87
Expired or canceled		(3)	$	69.70
Outstanding at March 31, 2025		929	$	70.20

(1)Represents weighted average market value of the shares; awards are granted at no cost to the recipients.

Performance Share Units (“PSUs”) – PSUs are earned based on our financial performance over a contractual term of three years and the associated expense is recognized over that period based on the fair value of the award. A three-year cliff vesting schedule of the PSUs is dependent upon the Company’s performance relative to pre-established goals based on an earnings per share target (weighted 70%) and total growth in revenue (weighted 30%). The fair value of PSUs is calculated using the market value of a share of our common stock on the date of grant. For performance achieved above specified levels, the recipient may earn additional shares of stock, not to exceed 200% of the number of PSUs initially granted. For the PSUs granted in 2025, the recipients may earn additional shares of stock, not to exceed 300% of the number of PSUs initially granted if performance achieved above specified levels.

The following table presents our PSUs activity during the three months ended March 31, 2025 (in thousands, except per share data):


	Performance Share Units	Weighted Average Grant-Date Fair Value Per Unit (1)
Outstanding at beginning of year	285	$	48.18
Granted	81	$	84.67
Vested	(124)	$	38.12
Adjustments for performance results	(3)	$	38.12

Outstanding at March 31, 2025	239	$	65.80

(1)Represents weighted average market value of the PSUs; PSUs are granted at no cost to the recipients.

ACCOUNTS RECEIVABLE, NET - Summary of Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Receivables [Abstract]
Trade accounts receivable	$ 488,607	$ 416,211
Unbilled revenue, at net realizable value	290,448	150,362
Total accounts receivable	779,055	566,573
Allowance for doubtful accounts	(43,629)	(31,715)	$ (25,598)
Accounts receivable, net	$ 735,426	$ 534,858

SUBSEQUENT EVENTS (Details) - Interest Rate Swap, Effective April 2025 - Subsequent Event $ in Millions	Apr. 14, 2025 USD ($)
Subsequent Event [Line Items]
Derivative, term of contract	5 years
Derivative, notional amount	$ 50
Interest rate swap, fixed interest rate	3.503%

BUSINESS COMBINATIONS (Tables)

3 Months Ended

Mar. 31, 2025

Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]

Summary of Recognized Identified Assets Acquired and Liabilities Assumed


	On November 1, 2024
	Fair Value
Total consideration transferred	$	1,997,781
Asset acquired:
Account receivable	169,866
Unbilled revenue	23,247
Other current assets	25,829
Property and equipment	31,221
Other intangible assets	490,000
Right-of- use asset	164,970
Deferred income taxes, net	3,485
Total identifiable asset acquired	908,618
Liabilities assumed:
Account payable	25,384
Accrued personnel costs	44,407
Other current liabilities	67,156
Contingent purchase price assumed (current and non-current)	25,042
Lease liabilities (current and non-current)	172,792
Other non-current liabilities	935
Total liabilities assumed	335,716
Net asset acquired	572,902
Goodwill	$	1,424,879

DEBT AND FINANCING ARRANGEMENTS (Tables)

3 Months Ended

Mar. 31, 2025

Debt Disclosure [Abstract]

Summary of Classification Between Short-Term and Long-Term Debt

The balance outstanding under the 2024 Credit Facilities at March 31, 2025 and December 31, 2024 was as follows (in thousands):


	March 31, 2025		December 31, 2024
Short-term debt
Current portion Term Loan	$	70,000	$	70,000
Current portion debt issuance costs, Term Loan	(3,774)		(3,823)
Total short-term debt, net	$	66,226	$	66,177

Long-term debt
Revolver Facility	$	165,900	$	20,900
Debt issuance costs, Revolver	(6,836)		(7,160)
Long Term Portion Term Loan	1,312,500		1,330,000
Long Term Portion Debt Issuance Costs, Term Loan	(9,060)		(9,985)
Total long-term debt, net	$	1,462,504	$	1,333,755

Summary of Unsecured Credit Facility

The blended effective interest rates under the 2024 Credit Facilities and the 2022 Credit Facility, including the impact of interest rate swaps associated with those credit facilities, for the three months ended March 31, 2025 and 2024 were as follows:


	Three Months Ended March 31,
	2025	2024
Weighted average rates	6.57%	5.23%
Range of effective rates	3.18% - 8.75%	1.93% - 6.83%

EMPLOYEE STOCK PLANS (Tables)

3 Months Ended

Mar. 31, 2025

Share-Based Payment Arrangement [Abstract]

Summary of Compensation Expense for Stock-Based Awards

Compensation expense for stock-based awards recognized during the three months ended March 31, 2025 and 2024 was as follows (in thousands):


	Three Months Ended March 31,
	2025		2024

Restricted stock units and awards	$	4,859	$	1,351
Performance share units	780		1,287
Total stock-based compensation expense	$	5,639	$	2,638

Summary of Restricted Stock Units and Awards Activity and Performance Share Units Activity

The following table presents our restricted stock units and awards activity during the three months ended March 31, 2025 (in thousands, except per share data):


	Restricted Stock Units and Awards
		Number of Shares	Weighted Average Grant-Date Fair Value (1)
Outstanding at beginning of year		899	$	67.01
Granted		111	$	81.64
Exercised or released		(78)	$	49.87
Expired or canceled		(3)	$	69.70
Outstanding at March 31, 2025		929	$	70.20

(1)Represents weighted average market value of the shares; awards are granted at no cost to the recipients.

The following table presents our PSUs activity during the three months ended March 31, 2025 (in thousands, except per share data):


	Performance Share Units	Weighted Average Grant-Date Fair Value Per Unit (1)
Outstanding at beginning of year	285	$	48.18
Granted	81	$	84.67
Vested	(124)	$	38.12
Adjustments for performance results	(3)	$	38.12

Outstanding at March 31, 2025	239	$	65.80

(1)Represents weighted average market value of the PSUs; PSUs are granted at no cost to the recipients.

DEBT AND FINANCING ARRANGEMENTS - Summary of Unsecured Credit Facility (Details) - Line of credit	Mar. 31, 2025	Mar. 31, 2024
Debt Instrument [Line Items]
Weighted average rates	6.57%	5.23%
Minimum
Debt Instrument [Line Items]
Range of effective rates	3.18%	1.93%
Maximum
Debt Instrument [Line Items]
Range of effective rates	8.75%	6.83%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

DEBT AND FINANCING ARRANGEMENTS - Summary of Classification Between Short-Term and Long-Term Debt (Details) - USD ($)
$ in Thousands

Mar. 31, 2025

Dec. 31, 2024

Short-term debt

Total short-term debt, net

^[1]

$ 66,226

$ 66,177

Long-term debt

Total long-term debt, net

^[1]

1,462,504

1,333,755

Secured Debt

Short-term debt

Current portion Term Loan

70,000

Current portion debt issuance costs, Term Loan

(3,774)

(3,823)

Long-term debt

Long-term line of credit

1,312,500

1,330,000

Debt issuance costs, noncurrent

(9,060)

(9,985)

Revolving Credit Facility

Long-term debt

Long-term line of credit

165,900

20,900

Debt issuance costs, noncurrent

$ (6,836)

$ (7,160)

[1]	Reflects the net debt for the Term Loan and Revolver with the associated debt issuance costs in short-term and long-term liabilities. See Note 5. Debt and Financing Arrangements for further discussion of the short-term and long-term debt.

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2025
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands

Mar. 31, 2025

Dec. 31, 2024

Current assets:

Cash and cash equivalents

$ 8,850

$ 13,826

Restricted cash

40,777

38,661

Accounts receivable, net

735,426

534,858

Other current assets

76,847

72,528

Current assets before funds held for clients

861,900

659,873

Funds held for clients

140,932

175,853

Total current assets

1,002,832

835,726

Non-current assets:

Property and equipment, net

92,092

88,163

Goodwill and other intangible assets, net

2,906,525

2,945,470

Assets of deferred compensation plan

162,066

167,170

Right-of-use assets, net

382,051

393,512

Other non-current assets

39,932

40,842

Total non-current assets

3,582,666

3,635,157

Total assets

4,585,498

4,470,883

Current liabilities:

Accounts payable

102,646

90,646

Income taxes payable

42,388

Accrued personnel costs

87,874

172,759

Contingent purchase price liabilities

46,731

61,164

Operating lease liabilities

61,673

60,549

Short-term debt

^[1]

66,226

66,177

Other current liabilities

111,658

78,579

Current liabilities before client fund obligations

519,196

529,874

Client fund obligations

140,867

175,928

Total current liabilities

660,063

705,802

Non-current liabilities:

Long-term debt

^[1]

1,462,504

1,333,755

Income taxes payable

2,538

2,193

Deferred income taxes, net

1,022

10,880

Deferred compensation plan obligations

162,066

167,170

Contingent purchase price liabilities

19,232

35,803

Lease liabilities

360,140

372,586

Other non-current liabilities

3,232

62,711

Total non-current liabilities

2,010,734

1,985,098

Total liabilities

2,670,797

2,690,900

STOCKHOLDERS' EQUITY

Common stock

1,420

1,380

Additional paid in capital

1,812,729

1,791,863

Retained earnings

1,018,895

896,122

Treasury stock

(918,327)

(910,601)

Accumulated other comprehensive (loss) income

(16)

1,219

Total stockholders’ equity

1,914,701

1,779,983

Total liabilities and stockholders’ equity

$ 4,585,498

$ 4,470,883

[1]	Reflects the net debt for the Term Loan and Revolver with the associated debt issuance costs in short-term and long-term liabilities. See Note 5. Debt and Financing Arrangements for further discussion of the short-term and long-term debt.

FINANCIAL INSTRUMENTS - Summary of Activities Related to Investments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available for Sale [Roll Forward]
Fair value at beginning of period	$ 40,999	$ 39,459
Purchases	8,300	23,210
Redemptions	(1,400)	(500)
Maturities	(7,010)	(21,423)
Change in bond premium	90	(386)
Fair market value adjustment	102	639
Fair value at end of period	$ 41,081	$ 40,999

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 103
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-103

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481830/320-10-45-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

+ Details

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net income	$ 122,773	$ 76,884
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization expense	24,791	9,468
Bad debt expense, net of recoveries	417	550
Adjustment to contingent earnout liability	502	434
Stock-based compensation expense	5,639	2,638
Deferred income taxes	4,320	2,057
Other, net	1,009	150
Changes in assets and liabilities, net of acquisitions and divestitures:
Accounts receivable, net	(201,258)	(121,551)
Other assets	(8,990)	(2,592)
Accounts payable	11,985	5,743
Income taxes payable	45,626	24,827
Accrued personnel costs	(84,642)	(62,381)
Other liabilities	(10,438)	53
Net cash used in operating activities	(88,266)	(63,720)
Cash flows from investing activities:
Business acquisitions and purchases of client lists, net of cash acquired	0	(21,337)
Purchases of client fund investments	(8,300)	(4,440)
Proceeds from the sales and maturities of client fund investments	8,410	5,450
Proceeds from sales of divested operations	289	0
Change in funds held for clients	(91)	(1,015)
Additions to property and equipment	(5,177)	(5,121)
Other, net	(92)	(2,239)
Net cash used in investing activities	(4,961)	(28,702)
Cash flows from financing activities:
Proceeds from bank debt	485,600	381,200
Payment of bank debt	(358,100)	(255,800)
Indirect repurchase of shares for minimum tax withholding	(7,555)	(11,229)
Changes in client funds obligations	(35,062)	(11,859)
Payment of contingent consideration for acquisitions and client lists	(29,520)	(31,124)
Net cash provided by financing activities	55,363	71,188
Net decrease in cash, cash equivalents and restricted cash	(37,864)	(21,234)
Cash, cash equivalents and restricted cash at beginning of year	187,170	157,148
Cash, cash equivalents and restricted cash at end of period	149,306	135,914
Reconciliation of cash, cash equivalents and restricted cash to the Condensed Consolidated Balance Sheets:
Cash and cash equivalents	8,850	1,402
Restricted cash	40,777	27,740
Cash equivalents included in funds held for clients	99,679	106,772
Total cash, cash equivalents and restricted cash	$ 149,306	$ 135,914

EMPLOYEE STOCK PLANS - Summary of Restricted Stock Units and Awards Activity (Details) - Restricted Stock Units and Awards shares in Thousands	3 Months Ended
	Mar. 31, 2025 $ / shares shares
Number of Shares
Outstanding at beginning of period (in shares) \| shares	899
Granted (in shares) \| shares	111
Exercised or released (in shares) \| shares	(78)
Expired or canceled (in shares) \| shares	(3)
Outstanding at end of period (in shares) \| shares	929
Weighted Average Grant-Date Fair Value
Outstanding at beginning of period (in dollars per share) \| $ / shares	$ 67.01
Granted (in dollars per share) \| $ / shares	81.64
Exercised or released (in dollars per share) \| $ / shares	49.87
Expired or canceled (in dollars per share) \| $ / shares	69.70
Outstanding at end of period (in dollars per share) \| $ / shares	$ 70.20

FINANCIAL INSTRUMENTS - Summary of Effects of Interest Rate Swap (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI, net of tax	$ (1,301)	$ 960
Interest rate swaps
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI, net of tax	(717)	1,854
Gain Reclassified from AOCI into Expense	$ 779	$ 1,191

BUSINESS COMBINATIONS - Additional Information (Details) $ in Thousands, shares in Millions		3 Months Ended
	Nov. 01, 2024 USD ($) shares	Apr. 01, 2025 shares	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Apr. 25, 2025 installment shares	Dec. 31, 2024 USD ($)
Business Acquisition, Contingent Consideration [Line Items]
Cash consideration			$ 0	$ 21,337
Marcum LLP
Business Acquisition, Contingent Consideration [Line Items]
Revenues			328,700
Operating income			86,500
Cash consideration	$ 1,063,000
Common stock	$ 934,700
Common stock issued (in shares) \| shares	13.6
Reduction of goodwill			20,200
Reduction of the estimated settlement amounts associated with acquired non-current liability			21,000
Other non-current liabilities	$ 935		40,000			$ 61,000
Other immaterial adjustments			$ 800
Marcum LLP \| Subsequent Event
Business Acquisition, Contingent Consideration [Line Items]
Business acquisitions (in shares) \| shares		4.0
Remaining number of shares issuable (in shares) \| shares					9.6
Number of monthly installments for remaining shares issuable \| installment					32

FAIR VALUE MEASUREMENTS - Summary of Changes in Contingent Purchase Price Consideration (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Net expense	$ 467	$ 434
Cash settlement paid	$ 29,520	$ 30,957
Shares issued (number)	33	60

FINANCIAL INSTRUMENTS

3 Months Ended

Mar. 31, 2025

Investments, All Other Investments [Abstract]

FINANCIAL INSTRUMENTS

Available-For-Sale Debt Securities - In connection with certain services provided by our payroll operations, we collect funds from our clients’ accounts in advance of paying client obligations. These funds held for clients are segregated and invested in accordance with our investment policy, which requires all investments carry an investment grade rating at the time of initial investment. These investments, primarily consisting of corporate and municipal bonds, are classified as available-for-sale and are included in the “Funds held for clients” line item on the accompanying unaudited Condensed Consolidated Balance Sheets. The par value of these investments totaled $41.0 million and $41.3 million at March 31, 2025 and December 31, 2024, respectively, and these investments have maturity or callable dates ranging from April 2025 through February 2028.

At March 31, 2025, unrealized losses on the securities were not material and have not been recognized as a credit loss because the bonds are investment grade quality and management is not required or does not intend to sell prior to an expected recovery in value. The bond issuers continue to make timely principal and interest payments.

The following table summarizes activities related to these investments for the three months ended March 31, 2025 and the year ended December 31, 2024 (in thousands):


	Three Months Ended March 31, 2025		Year Ended December 31, 2024
Fair value at beginning of period	$	40,999	$	39,459
Purchases	8,300		23,210
Redemptions	(1,400)		(500)
Maturities	(7,010)		(21,423)
Change in bond premium	90		(386)
Fair market value adjustment	102		639
Fair value at end of period	$	41,081	$	40,999

In addition to the available-for-sale debt securities discussed above, we also held other depository assets in the amount of $0.2 million and $0.2 million at March 31, 2025 and December 31, 2024, respectively. Those depository assets are classified as Level 1 in the fair value hierarchy.

Interest Rate Swaps - We utilize interest rate swaps to manage interest rate risk exposure associated with our floating-rate debt under the 2024 Credit Facilities, or the forecasted acquisition of such liability. We do not purchase or hold any derivative instruments for trading or speculative purposes. Refer to the Annual Report on Form 10-K for the year ended December 31, 2024 for further discussion on our interest rate swaps.


	March 31, 2025
	Notional Amount		Fixed Rate		Expiration	Fair Value		Balance Sheet Location
Interest rate swap	$	50,000	0.834	%	4/14/2025	$	67	Other current asset
Interest rate swap	$	30,000	1.186	%	12/14/2026	$	1,266	Other non-current asset
Interest rate swap	$	20,000	2.450	%	8/14/2027	$	549	Other non-current asset
Interest rate swap	$	25,000	3.669	%	4/14/2028	$	(37)	Other non-current liability
Interest rate swap	$	25,000	4.488	%	10/14/2028	$	(710)	Other non-current liability
Interest rate swap (1)	$	50,000	3.703	%	3/14/2030	$	(189)	Other non-current liability

(1)Entered into during the first quarter of 2025.


	December 31, 2024
	Notional Amount		Fixed Rate		Expiration	Fair Value		Balance Sheet Location
Interest rate swap	$	50,000	0.834	%	4/14/2025	$	495	Other current asset
Interest rate swap	$	30,000	1.186	%	12/14/2026	$	1,604	Other non-current asset
Interest rate swap	$	20,000	2.450	%	8/14/2027	$	776	Other non-current asset
Interest rate swap	$	25,000	3.669	%	4/14/2028	$	243	Other non-current asset
Interest rate swap	$	25,000	4.488	%	10/14/2028	$	(437)	Other non-current liability

Refer to Note 8, Fair Value Measurements, for additional disclosures regarding fair value measurements.


	Gain (Loss) Recognized in AOCI, net of tax				Gain Reclassified from AOCI into Expense
	Three Months Ended March 31,				Three Months Ended March 31,
	2025		2024		2025		2024
Interest rate swaps	$	(717)	$	1,854	$	779	$	1,191

SUBSEQUENT EVENTS	3 Months Ended
SUBSEQUENT EVENTS	Mar. 31, 2025
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTSOn April 14, 2025, we entered into a 5-year interest rate swap with a notional value of $50 million and a fixed rate of 3.503%. The interest rate swap expires on April 14, 2030.

BUSINESS COMBINATIONS - Summary of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - Marcum LLP - USD ($) $ in Thousands	Nov. 01, 2024	Mar. 31, 2025	Dec. 31, 2024
Business Acquisition [Line Items]
Total consideration transferred	$ 1,997,781
Asset acquired:
Account receivable	169,866
Unbilled revenue	23,247
Other current assets	25,829
Property and equipment	31,221
Other intangible assets	490,000
Right-of- use asset	164,970
Deferred income taxes, net	3,485
Total identifiable asset acquired	908,618
Liabilities assumed:
Account payable	25,384
Accrued personnel costs	44,407
Other current liabilities	67,156
Contingent purchase price assumed (current and non-current)	25,042
Lease liabilities (current and non-current)	172,792
Other non-current liabilities	935	$ 40,000	$ 61,000
Total liabilities assumed	335,716
Net asset acquired	572,902
Goodwill	$ 1,424,879

FAIR VALUE MEASUREMENTS - Summary of Change in Level 3 Fair Values of Contingent Purchase Price Liabilities (Details) - Contingent Purchase Price Liabilities - Level 3 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (96,967)	$ (114,946)
Additions from business acquisitions	(757)	(13,522)
Settlement of contingent purchase price liabilities	32,228	34,716
Change in fair value of contingencies	170	70
Change in net present value of contingencies	(637)	(504)
Ending balance	$ (65,963)	$ (94,186)

SEGMENT DISCLOSURES - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenue	$ 838,014	$ 494,297
Corporate & other:
General & administrative expenses	28,070	18,711
Interest expense	25,156	4,511
Other (expense) income, net	1,966	(9,424)
Income before income tax expense	172,910	104,014
Operating Segments
Segment Reporting Information [Line Items]
Revenue	838,014	494,297
Personnel costs	488,122	293,760
Facility costs	26,920	15,580
Other costs, gains, and losses, net	90,562	51,661
Total segment expense	605,604	361,001
Corporate & other:
Income before income tax expense	232,410	133,296
Operating Segments \| Financial Services
Segment Reporting Information [Line Items]
Revenue	713,661	372,630
Personnel costs	411,302	216,615
Facility costs	23,710	12,335
Other costs, gains, and losses, net	75,296	36,525
Total segment expense	510,308	265,475
Corporate & other:
Income before income tax expense	203,353	107,155
Operating Segments \| Benefits and Insurance Services
Segment Reporting Information [Line Items]
Revenue	112,976	108,408
Personnel costs	66,665	65,723
Facility costs	3,208	3,182
Other costs, gains, and losses, net	15,158	14,688
Total segment expense	85,031	83,593
Corporate & other:
Income before income tax expense	27,945	24,815
Operating Segments \| National Practices
Segment Reporting Information [Line Items]
Revenue	11,377	13,259
Personnel costs	10,155	11,422
Facility costs	2	63
Other costs, gains, and losses, net	108	448
Total segment expense	10,265	11,933
Corporate & other:
Income before income tax expense	1,112	1,326
Corporate And Eliminations
Corporate & other:
Unallocated corporate operating expenses	3,797	15,354
General & administrative expenses	28,070	18,711
Interest expense	25,156	4,511
Other (expense) income, net	$ 2,477	$ (9,294)

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Revenue	$ 838,014	$ 494,297
Operating expenses	609,912	376,485
Gross margin	228,102	117,812
Corporate general and administrative expenses	28,070	18,711
Operating income	200,032	99,101
Other (expense) income:
Interest expense	(25,156)	(4,511)
Other (expense) income, net	(1,966)	9,424
Total other (expense) income, net	(27,122)	4,913
Income before income tax expense	172,910	104,014
Income tax expense	50,137	27,130
Net Income	$ 122,773	$ 76,884
Earnings per share:
Basic (in dollars per share)	$ 1.92	$ 1.54
Diluted (in dollars per share)	$ 1.91	$ 1.53
Basic weighted average shares outstanding (in shares)	63,843	50,045
Diluted weighted average shares outstanding (in shares)	64,142	50,221
Comprehensive income:
Net income	$ 122,773	$ 76,884
Other comprehensive (loss) income, net of tax	(1,235)	1,018
Comprehensive income	$ 121,538	$ 77,902

EARNINGS PER SHARE (Tables)

3 Months Ended

Mar. 31, 2025

Earnings Per Share [Abstract]

Summary of Computation of Basic and Diluted Earnings Per Share from Continuing Operations

The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2025 and 2024 (in thousands, except per share data):


	Three Months Ended March 31,
	2025		2024
Numerator:
Net Income	$	122,773	$	76,884
Denominator:
Basic
Weighted average common shares outstanding	63,843		50,045
Diluted
Stock options (1)	84		74
Restricted stock units and awards (1)	215		99

Contingent shares (2)	—		3
Diluted weighted average common shares outstanding (3)	64,142		50,221
Basic earnings per share	$	1.92	$	1.54
Diluted earnings per share	$	1.91	$	1.53

(2)Contingent shares represent additional shares to be issued for purchase price earned by former owners of businesses acquired by us once future conditions have been met.

DEBT AND FINANCING ARRANGEMENTS

3 Months Ended

Mar. 31, 2025

Debt Disclosure [Abstract]

DEBT AND FINANCING ARRANGEMENTS

2024 Credit Facilities - As of March 31, 2025, our primary financing arrangement is the 2024 Credit Facilities, which provides $2.0 billion in senior secured credit facilities, consisting of a $1.4 billion term loan (the “Term Loan”) and $600.0 million revolving credit facility (the “Revolving Credit Facility”). The 2024 Credit Facilities amend and restate the 2022 credit facility entered into on May 4, 2022 (the "2022 Credit Facility").

The 2024 Credit Facilities mature on November 1, 2029. The Term Loan provides for scheduled annual principal amortization payments of 5% in the first two years following closing, 7.5% annually in the third and fourth year following closing and 10% in the fifth year following closing, with the balance due at maturity.

The 2024 Credit Facilities contain certain restrictive covenants customary for facilities of this type, including restrictions on indebtedness, liens or other encumbrances, making certain payments, investments, or to sell or otherwise dispose of a substantial portion of assets, or to merge or consolidate with an unaffiliated entity. The 2024 Credit Facilities also limits our ability to make dividend payments. Historically, we have not paid cash dividends on our common stock. Our Board of Directors has discretion over the payment and level of dividends on common stock, subject to the limitations of the 2024 Credit Facilities and applicable law. The 2024 Credit Facilities contain a provision that, in the event of a defined change in control, the 2024 Credit Facilities may be terminated.

In addition, the 2024 Credit Facilities include a financial covenant requiring that Total Net Leverage Ratio not exceed 5.00 to 1.00 initially, stepping down in increments to 3.75 to 1.00 during and after the seventh fiscal quarter after the closing (with a limited ability to temporarily increase in connection with material acquisitions commencing in the sixth fiscal quarter after the closing). The 2024 Credit Facilities also require a Minimum Consolidated Interest Coverage Ratio of 3.00 to 1.00 and affirmative and negative covenants that are in each case generally similar to those contained in the 2022 Credit Facility, but with increases to certain baskets and caps and certain other exceptions. As of March 31, 2025 , we are in compliance with all covenants.

The balance outstanding under the 2024 Credit Facilities at March 31, 2025 and December 31, 2024 was as follows (in thousands):


	March 31, 2025		December 31, 2024
Short-term debt
Current portion Term Loan	$	70,000	$	70,000
Current portion debt issuance costs, Term Loan	(3,774)		(3,823)
Total short-term debt, net	$	66,226	$	66,177

Long-term debt
Revolver Facility	$	165,900	$	20,900
Debt issuance costs, Revolver	(6,836)		(7,160)
Long Term Portion Term Loan	1,312,500		1,330,000
Long Term Portion Debt Issuance Costs, Term Loan	(9,060)		(9,985)
Total long-term debt, net	$	1,462,504	$	1,333,755


	Three Months Ended March 31,
	2025	2024
Weighted average rates	6.57%	5.23%
Range of effective rates	3.18% - 8.75%	1.93% - 6.83%

We had approximately $384 million of available funds under the 2024 Credit Facilities at March 31, 2025, based on the terms of the commitment. Available funds under the 2024 Credit Facilities are based on a multiple of earnings before interest, taxes, depreciation and amortization as defined in the 2024 Credit Facilities, and are reduced by letters of credit, other indebtedness and outstanding borrowings under the 2024 Credit Facilities. Under the 2024 Credit Facilities, loans are charged an interest rate consisting of a base rate or term SOFR rate plus an applicable margin, letters of credit are charged based on the same applicable margin, and a commitment fee is charged on the unused portion of the 2024 Credit Facilities.

Refer to the Annual Report on Form 10-K for the year ended December 31, 2024 for further discussion on the 2024 Credit Facilities.

Other Line of Credit - We have an unsecured $20.0 million line of credit by and among CBIZ Benefits and Insurance, Inc. and Huntington National Bank. We utilize this line to support our short-term funding requirements of payroll client fund obligations due to the investment of client funds, rather than liquidating client funds that have already been invested in available-for-sale securities. The line of credit did not have a balance outstanding at March 31, 2025 and December 31, 2024. On August 1, 2024, we renewed the line of credit and it will now terminate on July 31, 2025.

Interest Expense - Interest expense, including amortization of deferred financing costs, commitment fees, line of credit fees, and other applicable bank charges, for the three months ended March 31, 2025 and 2024 was $25.2 million and $4.5 million, respectively.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477092/405-40-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 405
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
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+ Details

FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2025

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis


	Level	March 31, 2025		December 31, 2024
Assets of deferred compensation plan	1	$	162,066	$	167,170
Available-for-sale debt securities	1	41,081		40,999
Other depository assets	1	177		176
Deferred compensation plan obligations	1	(162,066)		(167,170)
Interest rate swaps	2	946		2,681
Bank debt	2	(1,528,730)		(1,399,932)
Contingent purchase price liabilities	3	(65,963)		(96,967)

Summary of Change in Level 3 Fair Values of Contingent Purchase Price Liabilities

The following table summarizes the change in Level 3 fair values of our contingent purchase price liabilities for the three months ended March 31, 2025 and 2024 (pre-tax basis, in thousands):


	2025		2024
Beginning balance – December 31	$	(96,967)	$	(114,946)
Additions from business acquisitions	(757)		(13,522)

Settlement of contingent purchase price liabilities	32,228		34,716
Change in fair value of contingencies	170		70
Change in net present value of contingencies	(637)		(504)
Ending balance – March 31	$	(65,963)	$	(94,186)

Summary of Changes in Contingent Purchase Price Consideration


	Three Months Ended March 31,
	2025		2024
Net expense	$	467	$	434
Cash settlement paid	$	29,520	$	30,957
Shares issued (number)	33		60

EMPLOYEE STOCK PLANS - Additional Information (Details) - $ / shares	3 Months Ended
	Mar. 31, 2025	May 10, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0
Stock options exercised (in shares)	0
Stock options outstanding (in shares)	150,000
Weighted average exercise price (in dollars per share)	$ 35.22
Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, remaining contractual term	3 years
Performance share units, vesting period	3 years
Achievement of an earnings per share target	70.00%
Achievement of total growth in revenue	30.00%
Performance share units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of initial grant, tranche one	200.00%
Percentage of initial grant, tranche two	300.00%
2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized for issuance (in shares)		1,500,000
Maximum stock based compensation awards granted under the plan (in shares)		4,600,000