Barrett Business Services (BBSI) 10-Q 6 Nov 24 2024 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2024	Oct. 23, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Trading Symbol	BBSI
Entity Registrant Name	BARRETT BUSINESS SERVICES, INC.
Entity Central Index Key	0000902791
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		25,937,049
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, Par Value $0.01 Per Share
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	MD
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	0-21886
Entity Tax Identification Number	52-0812977
Entity Address, Address Line One	8100 NE Parkway Drive
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Vancouver
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	98662
City Area Code	360
Local Phone Number	828-0700

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents		$ 14,429	$ 71,168
Investments		79,934	81,027
Trade accounts receivable, net		253,749	171,407
Income taxes receivable		2,796	7,987
Prepaid expenses and other		18,768	18,443
Restricted cash and investments		83,009	97,470
Total current assets		452,685	447,502
Property, equipment and software, net		55,633	50,295
Operating lease right-of-use assets		20,595	19,898
Restricted cash and investments		140,834	145,583
Goodwill		47,820	47,820
Other assets		5,995	6,222
Deferred income taxes		2,206	4,218
Total assets		725,768	721,538
Current liabilities:
Accounts payable		4,222	6,593
Accrued payroll, payroll taxes and related benefits		268,831	234,080
Current operating lease liabilities		6,304	6,623
Current premium payable		12,778	35,276
Other accrued liabilities		10,453	10,674
Workers' compensation claims liabilities		42,291	50,006
Total current liabilities		344,879	343,252
Long-term workers' compensation claims liabilities		94,512	117,757
Long-term premium payable		44,621	37,812
Long-term operating lease liabilities		15,416	14,590
Customer deposits and other long-term liabilities		10,954	8,987
Total liabilities		510,382	522,398
Commitments and contingencies (Notes 4 and 6)
Stockholders' equity:
Common stock, $.01 par value; 82,000 shares authorized, 25,937 and 26,290 shares issued and outstanding	[1]	259	263
Additional paid-in capital	[1]	38,640	36,743
Accumulated other comprehensive loss		(15,536)	(20,801)
Retained earnings		192,023	182,935
Total stockholders' equity		215,386	199,140
Total liabilities and stockholders' equity		$ 725,768	$ 721,538
[1] Prior period results have been adjusted to reflect the four -for-one stock split effected in the form of a stock dividend in June 2024. See Note 1, Basis of Presentation of Interim Period Statements for details.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical)	9 Months Ended
	Sep. 30, 2024 $ / shares shares	Dec. 31, 2023 $ / shares shares
Statement of Financial Position [Abstract]
Common stock, par value | $ / shares	$ 0.01	$ 0.01
Common stock, shares authorized	82,000,000	82,000,000
Common stock, shares issued	25,937,000	26,290,000
Common stock, shares outstanding	25,937,000	26,290,000
Stock split, conversion ratio	0.25

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues:
Total revenues		$ 294,278	$ 273,328	$ 839,711	$ 792,625
Cost of revenues:
Total cost of revenues		219,866	204,999	657,835	615,706
Gross margin		74,412	68,329	181,876	176,919
Selling, general and administrative expenses		49,060	44,160	137,051	129,194
Depreciation and amortization		1,899	1,867	5,663	5,273
Income from operations		23,453	22,302	39,162	42,452
Other income (expense):
Investment income, net		2,265	2,412	8,608	6,856
Interest expense		(45)	(80)	(133)	(118)
Other, net		31	38	124	93
Other income, net		2,251	2,370	8,599	6,831
Income before income taxes		25,704	24,672	47,761	49,283
Provision for income taxes		6,076	6,453	11,568	13,229
Net income		$ 19,628	$ 18,219	$ 36,193	$ 36,054
Basic income per common share	[1]	$ 0.75	$ 0.68	$ 1.38	$ 1.33
Weighted average number of basic common shares outstanding	[1]	26,052	26,795	26,133	27,088
Diluted income per common share	[1]	$ 0.74	$ 0.67	$ 1.35	$ 1.31
Weighted average number of diluted common shares outstanding	[1]	26,620	27,182	26,736	27,541
Professional Employer Services [Member]
Revenues:
Total revenues		$ 272,793	$ 251,423	$ 778,869	$ 727,986
Staffing Services [Member]
Revenues:
Total revenues		21,485	21,905	60,842	64,639
Direct Payroll Costs [Member]
Cost of revenues:
Total cost of revenues		16,208	16,318	45,618	48,299
Payroll Taxes and Benefits [Member]
Cost of revenues:
Total cost of revenues		154,109	135,704	464,814	414,395
Workers' Compensation [Member]
Cost of revenues:
Total cost of revenues		$ 49,549	$ 52,977	$ 147,403	$ 153,012
[1] Prior period results have been adjusted to reflect the four -for-one stock split effected in the form of a stock dividend in June 2024. See Note 1, Basis of Presentation of Interim Period Statements for details.

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Operations (Parenthetical)		6 Months Ended	9 Months Ended
	Jun. 04, 2024	Jun. 30, 2024	Sep. 30, 2024
Income Statement [Abstract]
Stock split, conversion ratio	0.25	0.25	0.25

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 19,628	$ 18,219	$ 36,193	$ 36,054
Unrealized gains (losses) on investments, net of tax	6,804	(3,707)	5,265	(2,083)
Comprehensive income	$ 26,432	$ 14,512	$ 41,458	$ 33,971

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) on investments, tax	$ 2,600	$ (1,417)	$ 2,012	$ (796)

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock [Member]		Additional Paid-in Capital [Member]		Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Beginning Balance at Dec. 31, 2022		$ 177,842	$ 275	[1]	$ 32,538	[1]	$ (27,594)	$ 172,623
Beginning Balance, shares at Dec. 31, 2022	[1]		27,483
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards		339	$ 1	[1]	338	[1]
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares	[1]		122
Common stock repurchased on vesting of restricted stock units and performance awards		(1,005)			(1,005)	[1]
Common stock repurchased on vesting of restricted stock units and performance awards, shares	[1]		(43)
Share-based compensation expense		1,928			1,928	[1]
Company repurchases of common stock		(8,030)	$ (4)	[1]	(444)	[1]		(7,582)
Company repurchases of common stock, shares	[1]		(362)
Cash dividends on common stock		(2,067)						(2,067)
Unrealized gain (loss) on investments, net of tax		3,652					3,652
Net Income (Loss)		819						819
Ending Balance at Mar. 31, 2023		173,478	$ 272	[1]	33,355	[1]	(23,942)	163,793
Ending Balance, shares at Mar. 31, 2023	[1]		27,200
Beginning Balance at Dec. 31, 2022		177,842	$ 275	[1]	32,538	[1]	(27,594)	172,623
Beginning Balance, shares at Dec. 31, 2022	[1]		27,483
Unrealized gain (loss) on investments, net of tax		(2,083)
Net Income (Loss)		36,054
Ending Balance at Sep. 30, 2023		180,446	$ 265	[1]	34,648		(29,677)	175,210
Ending Balance, shares at Sep. 30, 2023	[1]		26,466
Beginning Balance at Mar. 31, 2023		173,478	$ 272	[1]	33,355	[1]	(23,942)	163,793
Beginning Balance, shares at Mar. 31, 2023	[1]		27,200
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards		2			2	[1]
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares	[1]		50
Common stock repurchased on vesting of restricted stock units and performance awards		(304)			(304)	[1]
Common stock repurchased on vesting of restricted stock units and performance awards, shares	[1]		(14)
Share-based compensation expense		1,963			1,963	[1]
Company repurchases of common stock		(10,145)	$ (5)	[1]	(640)	[1]		(9,500)
Company repurchases of common stock, shares	[1]		(492)
Cash dividends on common stock		(2,013)						(2,013)
Unrealized gain (loss) on investments, net of tax		(2,028)					(2,028)
Net Income (Loss)		17,016						17,016
Ending Balance at Jun. 30, 2023		177,969	$ 267	[1]	34,376	[1]	(25,970)	169,296
Ending Balance, shares at Jun. 30, 2023	[1]		26,744
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards		361	$ 3	[1]	358
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares	[1]		257
Common stock repurchased on vesting of restricted stock units and performance awards		(1,590)	$ (1)	[2]	(1,589)
Common stock repurchased on vesting of restricted stock units and performance awards, shares	[1]		(73)
Share-based compensation expense		2,136			2,136
Company repurchases of common stock		(10,917)	$ (4)	[1]	(633)			(10,280)
Company repurchases of common stock, shares	[1]		(462)
Cash dividends on common stock		(2,025)						(2,025)
Unrealized gain (loss) on investments, net of tax		(3,707)					(3,707)
Net Income (Loss)		18,219						18,219
Ending Balance at Sep. 30, 2023		180,446	$ 265	[1]	34,648		(29,677)	175,210
Ending Balance, shares at Sep. 30, 2023	[1]		26,466
Beginning Balance at Dec. 31, 2023		199,140	$ 263	[2]	36,743	[2]	(20,801)	182,935
Beginning Balance, shares at Dec. 31, 2023	[2]		26,290
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards		376	$ 1	[2]	375	[2]
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares	[2]		140
Common stock repurchased on vesting of restricted stock units and performance awards		(1,456)	$ (1)	[2]	(1,455)	[2]
Common stock repurchased on vesting of restricted stock units and performance awards, shares	[2]		(50)
Share-based compensation expense		2,187			2,187	[2]
Company repurchases of common stock		(7,056)	$ (2)	[2]	(350)	[2]		(6,704)
Company repurchases of common stock, shares	[2]		(236)
Cash dividends on common stock		(1,970)						(1,970)
Unrealized gain (loss) on investments, net of tax		(1,496)					(1,496)
Net Income (Loss)		(136)						(136)
Ending Balance at Mar. 31, 2024		189,589	$ 261	[2]	37,500	[2]	(22,297)	174,125
Ending Balance, shares at Mar. 31, 2024	[2]		26,144
Beginning Balance at Dec. 31, 2023		199,140	$ 263	[2]	36,743	[2]	(20,801)	182,935
Beginning Balance, shares at Dec. 31, 2023	[2]		26,290
Unrealized gain (loss) on investments, net of tax		5,265
Net Income (Loss)		36,193
Ending Balance at Sep. 30, 2024		215,386	$ 259	[2]	38,640		(15,536)	192,023
Ending Balance, shares at Sep. 30, 2024	[2]		25,937
Beginning Balance at Mar. 31, 2024		189,589	$ 261	[2]	37,500	[2]	(22,297)	174,125
Beginning Balance, shares at Mar. 31, 2024	[2]		26,144
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards		7			7	[2]
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares	[2]		41
Common stock repurchased on vesting of restricted stock units and performance awards		(397)			(397)	[2]
Common stock repurchased on vesting of restricted stock units and performance awards, shares	[2]		(13)
Share-based compensation expense		2,106			2,106	[2]
Company repurchases of common stock		(7,047)	$ (2)	[2]	(334)	[2]		(6,711)
Company repurchases of common stock, shares	[2]		(223)
Cash dividends on common stock		(1,955)						(1,955)
Unrealized gain (loss) on investments, net of tax		(43)					(43)
Net Income (Loss)		16,701						16,701
Ending Balance at Jun. 30, 2024		198,961	$ 259	[2]	38,882	[2]	(22,340)	182,160
Ending Balance, shares at Jun. 30, 2024	[2]		25,949
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards		548	$ 3	[2]	545	[2]
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares	[2]		302
Common stock repurchased on vesting of restricted stock units and performance awards		(2,802)	$ (1)	[2]	(2,801)	[2]
Common stock repurchased on vesting of restricted stock units and performance awards, shares	[2]		(85)
Share-based compensation expense		2,355			2,355	[2]
Company repurchases of common stock		(8,022)	$ (2)	[2]	(341)	[2]		(7,679)
Company repurchases of common stock, shares	[2]		(229)
Cash dividends on common stock		(2,086)						(2,086)
Unrealized gain (loss) on investments, net of tax		6,804					6,804
Net Income (Loss)		19,628						19,628
Ending Balance at Sep. 30, 2024		$ 215,386	$ 259	[2]	$ 38,640		$ (15,536)	$ 192,023
Ending Balance, shares at Sep. 30, 2024	[2]		25,937
[1] Prior period results have been adjusted to reflect the four -for-one stock split effected in the form of a stock dividend in June 2024. See Note 1, Basis of Presentation of Interim Period Statements for details. Prior period results have been adjusted to reflect the four -for-one stock split effected in the form of a stock dividend in June 2024. See Note 1, Basis of Presentation of Interim Period Statements for details.

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical)	3 Months Ended
	Sep. 30, 2024 $ / shares	Jun. 30, 2024 $ / shares	Mar. 31, 2024 $ / shares	Sep. 30, 2023 $ / shares	Jun. 30, 2023 $ / shares	Mar. 31, 2023 $ / shares
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock per share	$ 0.08	$ 0.075	$ 0.075	$ 0.075	$ 0.075	$ 0.075

Condensed Consolidated Statem_7

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income	$ 36,193	$ 36,054
Reconciliations of net income to net cash (used in) provided by operating activities:
Depreciation and amortization	5,663	5,273
Non-cash lease expense	4,876	5,270
Net investment (accretion) amortization and (gains) losses recognized	(309)	543
Share-based compensation	6,648	6,027
Changes in certain operating assets and liabilities:
Trade accounts receivable	(82,342)	(41,379)
Income taxes	5,191	176
Prepaid expenses and other	(325)	2,651
Accounts payable	(2,371)	(2,996)
Accrued payroll, payroll taxes and related benefits	35,026	25,801
Other accrued liabilities	(245)	(6,447)
Premium payable	(15,689)	23,234
Workers' compensation claims liabilities	(30,735)	(38,693)
Operating lease liabilities	(5,066)	(5,274)
Other assets and liabilities, net	197	(241)
Net cash (used in) provided by operating activities	(43,288)	9,999
Cash flows from investing activities:
Purchase of property, equipment and software	(11,001)	(8,115)
Proceeds from sale of property		117
Purchase of investments	(7,902)	(4,386)
Proceeds from sales and maturities of investments	10,871	805
Purchase of restricted investments	(27,542)	(20,943)
Proceeds from sales and maturities of restricted investments	64,596	14,975
Net cash provided by (used in) investing activities	29,022	(17,547)
Cash flows from financing activities:
Proceeds from credit-line borrowings	415
Payments on credit-line borrowings	(415)
Repurchases of common stock	(22,125)	(29,092)
Common stock repurchased on vesting of stock awards	(4,655)	(2,899)
Dividends paid	(6,011)	(6,105)
Proceeds from exercise of stock options and purchase of ESPP shares	931	702
Net cash used in financing activities	(31,860)	(37,394)
Net decrease in cash, cash equivalents and restricted cash	(46,126)	(44,942)
Cash, cash equivalents and restricted cash, beginning of period	74,841	107,378
Cash, cash equivalents and restricted cash, end of period	$ 28,715	$ 62,436

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 19,628	$ 16,701	$ (136)	$ 18,219	$ 17,016	$ 819	$ 36,193	$ 36,054

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2024
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

Basis of Presentation of Interi

Basis of Presentation of Interim Period Statements	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation of Interim Period Statements	Note 1 - Basis of Presentation of Interim Period Statements The accompanying condensed consolidated financial statements are unaudited and have been prepared by Barrett Business Services, Inc. (“BBSI”, the “Company”, “our” or “we”), pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and note disclosures typically included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the condensed consolidated financial statements include all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the results for the interim periods presented. The accompanying condensed financial statements are prepared on a consolidated basis. All intercompany account balances and transactions have been eliminated in consolidation. The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Actual results may differ from such estimates and assumptions. The condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s 2023 Annual Report on Form 10-K at pages 33 - 61. The results of operations for an interim period are not necessarily indicative of the results of operations for a full year. On June 4, 2024, we amended our Charter to increase the number of authorized shares of common stock from 20,500,000 shares to 82,000,000 shares, and our Board of Directors declared a four -for-one split of the Company’s common stock effected in the form of a stock dividend (the “2024 Stock Split”). Each stockholder of record at the close of business on June 14, 2024 received a dividend of three additional shares of common stock for each then-held share, distributed after close of trading on June 21, 2024. All share and per share amounts presented herein have been retroactively adjusted to reflect the impact of the 2024 Stock Split. The shares of common stock retain a par value of $ 0.01 per share. Accordingly, an amount equal to the par value of the increased shares resulting from the stock split was reclassified from additional paid-in capital to common stock. Revenue recognition Professional employer (“PEO”) services are normally used by organizations to satisfy ongoing needs related to the management of human capital and are governed by the terms of a client services agreement which covers all employees at a particular work site. Staffing revenues relate primarily to short-term staffing, contract staffing and on-site management services. The Company’s performance obligations for PEO and staffing services are satisfied, and the related revenue is recognized, as services are rendered by our workforce. Our PEO client service agreements have a minimum term of one year , are renewable on an annual basis and typically require 30 days’ written notice to cancel or terminate the contract by either party. In addition, our client service agreements provide for immediate termination upon any payment default of the client regardless of when notice is given. PEO customers are invoiced following the end of each payroll processing cycle, with payment generally due on the invoice date. Staffing customers are generally invoiced weekly based on agreed rates per employee and actual hours worked, typically with payment terms of 30 days. The amount of earned but unbilled revenue is classified as a receivable on the condensed consolidated balance sheets. We report PEO revenues net of direct payroll costs because we are not the primary obligor for these payments to our clients’ employees. Direct payroll costs include salaries, wages, health insurance, and employee out-of-pocket expenses incurred incidental to employment. Cost of revenues Our cost of revenues for PEO services includes employer payroll-related taxes, workers’ compensation costs and employee benefits costs. Our cost of revenues for staffing services includes direct payroll costs, employer payroll-related taxes, and workers’ compensation costs. Direct payroll costs represent the gross payroll earned by staffing services employees based on salary or hourly wages. Payroll taxes consist of the employer’s portion of Social Security and Medicare taxes and federal and state unemployment taxes. Benefit costs primarily comprise health insurance premiums paid to third-party carriers as part of our fully insured PEO benefits programs and underwriting and benefit consultant payroll. Workers’ compensation costs consist primarily of premiums paid to third-party insurers, claims reserves, claims administration fees, legal fees, medical cost containment (“MCC”) expense, state administrative agency fees, third-party broker commissions, and risk manager payroll, as well as costs associated with operating our two wholly owned insurance companies, Associated Insurance Company for Excess (“AICE”) and Ecole Insurance Company (“Ecole”). Cash and cash equivalents We consider non-restricted short-term investments that are highly liquid, readily convertible into cash, and have maturities at acquisition of less than three months to be cash equivalents for purposes of the condensed consolidated statements of cash flows and condensed consolidated balance sheets. The Company maintains cash balances in bank accounts that normally exceed FDIC insured limits. The Company has not experienced any losses related to its cash concentration. Investments The Company classifies investments as available-for-sale. The Company’s investments are reported at fair value with unrealized gains and losses, net of taxes, shown as a component of accumulated other comprehensive loss in stockholders’ equity. Investments are recorded as current on the condensed consolidated balance sheets as the invested funds are available for current operations. Management considers available evidence in evaluating potential impairment of investments, including the extent to which fair value is less than cost and adverse conditions related to the security. In the event of a credit loss, an allowance would be recognized to the extent that the fair value of the security is less than the present value of the expected future cash flows. Realized gains and losses on sales of investments are included in investment income in our condensed consolidated statements of operations. Restricted cash and investments The Company holds restricted cash and investments primarily for the future payment of insurance premiums and workers’ compensation claims. These investments are categorized as available-for-sale. They are reported at fair value with unrealized gains and losses, net of taxes, shown as a component of accumulated other comprehensive loss in stockholders’ equity. Restricted cash and investments are classified as current and noncurrent on the condensed consolidated balance sheets based on the nature of the restriction. Management considers available evidence in evaluating potential impairment of restricted investments, including the extent to which fair value is less than cost and adverse conditions related to the security. In the event of a credit loss, an allowance would be recognized to the extent that the fair value of the security is less than the present value of the expected future cash flows. Realized gains and losses on sales of restricted investments are included in investment income in our condensed consolidated statements of operations. Restricted cash and investments also includes investments held as part of the Company’s deferred compensation plan. These investments are classified as trading securities and are recorded at fair value with unrealized gains and losses reported as a component of income from operations. Allowance for expected credit losses The Company had an allowance for expected credit losses of $ 0.9 million at September 30, 2024 and December 31, 2023 . We make estimates of the collectability of our accounts receivable for services provided to our customers based on future expected credit losses. Management analyzes historical bad debts, customer concentrations, customer credit-worthiness, current economic trends and changes in customers’ payment trends when evaluating the adequacy of the allowance for expected credit losses. If the financial condition of our customers deteriorates resulting in an impairment of their ability to make payments, additional allowances may be required. Workers’ compensation claims liabilities Our workers’ compensation claims liabilities do not represent an exact calculation of liability but rather management’s best estimate, utilizing actuarial expertise and projection techniques, at a given reporting date. The estimated liability for open workers’ compensation claims is based on an evaluation of information provided by our third-party administrator for workers’ compensation claims, coupled with an actuarial estimate of future loss development with respect to reported claims and incurred but not reported claims (together, “IBNR”). Workers’ compensation claims liabilities include case reserve estimates for reported losses, plus additional amounts for estimated IBNR claims, MCC and legal costs, unallocated loss adjustment expenses and estimated future recoveries. The estimate of incurred costs expected to be paid within one year is included in current liabilities, while the estimate of incurred costs expected to be paid beyond one year is included in long-term liabilities on our condensed consolidated balance sheets. These estimates are reviewed at least quarterly and adjustments to estimated liabilities are reflected in current operating results as they become known. The process of arriving at an estimate of unpaid claims and claims adjustment expense involves a high degree of judgment and is affected by both internal and external events, including changes in claims handling practices, changes in reserve estimation procedures, inflation, trends in the litigation and settlement of pending claims, and legislative changes. Our estimates are based on actuarial analysis and informed judgment, derived from individual experience and expertise applied to multiple sets of data and analyses. We consider significant facts and circumstances known both at the time that loss reserves are initially established and as new facts and circumstances become known. Due to the inherent uncertainty underlying loss reserve estimates, the expenses incurred through final resolution of our liability for our workers’ compensation claims will likely vary from the related loss reserves at the reporting date. Therefore, as specific claims are paid out in the future, actual paid losses may be materially different from our current loss reserves. A basic premise in most actuarial analyses is that historical data and past patterns demonstrated in the incurred and paid historical data form a reasonable basis upon which to project future outcomes, absent a material change. Significant structural changes to the available data can materially impact the reserve estimation process. To the extent a material change affecting the ultimate claim liability becomes known, such change is quantified to the extent possible through an analysis of internal Company data and, if available and when appropriate, external data. Nonetheless, actuaries exercise a considerable degree of judgment in the evaluation of these factors and the need for such actuarial judgment is more pronounced when faced with material uncertainties. Customer deposits We require deposits from certain PEO customers to cover a portion of our accounts receivable due from such customers in the event of default of payment. Comprehensive income Comprehensive income includes all changes in equity during a period except those that resulted from investments by or distributions to the Company’s stockholders. Other comprehensive income refers to revenues, expenses, gains and losses that under GAAP are included in comprehensive income, but excluded from net income as these amounts are recorded directly as an adjustment to stockholders’ equity. Our other comprehensive income comprises unrealized holding gains and losses on our available-for-sale investments. Statements of cash flows Interest paid during the nine months ended September 30, 2024 and 2023 did not materially differ from interest expense. Income taxes paid by the Company during the nine months ended September 30, 2024 and 2023 totaled $ 8.0 m illion and $ 13.0 mil lion, respectively. Bank deposits and other cash equivalents that are restricted for use are classified as restricted cash. The table below reconciles the cash, cash equivalents and restricted cash balances from our condensed consolidated balance sheets to the amounts reported on the condensed consolidated statements of cash flows (in thousands): September 30, December 31, September 30, December 31, 2024 2023 2023 2022 Cash and cash equivalents $ 14,429 $ 71,168 $ 41,579 $ 91,423 Restricted cash, included in restricted cash and 14,286 3,673 20,857 15,955 Total cash, cash equivalents and restricted cash $ 28,715 $ 74,841 $ 62,436 $ 107,378 Basic and diluted earnings per share Basic earnings per share are computed based on the weighted average number of common shares outstanding for each year using the treasury method. Diluted earnings per share reflect the potential effects of the issuance of shares in connection with the exercise of outstanding stock options, vesting of outstanding restricted stock units and performance share units, and the Company’s employee stock purchase plan. Basic and diluted shares outstanding adjusted to reflect the 2024 Stock Split are summarized as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2024 2023 2024 2023 Weighted average number of basic shares outstanding 26,052 26,795 26,133 27,088 Effect of dilutive securities 568 387 603 453 Weighted average number of diluted shares outstanding 26,620 27,182 26,736 27,541 Accounting estimates The preparation of our condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions. These affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of revenues and expenses during the reporting periods. Management bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Estimates are used for fair value measurement of investments, allowance for expected credit losses, deferred income taxes, carrying values for goodwill and property, equipment and software, and accrued workers’ compensation liabilities. Actual results may or may not differ from such estimates. Reclassifications To conform to the current period’s presentation, safety incentives liability of $ 1.3 million was reclassified to other accrued liabilities in the prior period condensed consolidated balance sheets, and net cash outflows related to safety incentives liability of $ 0.6 million was reclassified to other accrued liabilities in the prior period condensed consolidated statements of cash flows. All share and per share amounts presented herein have been retroactively adjusted to reflect the impact of the 2024 Stock Split. To conform to the current period’s presentation, additional paid-in-capital of $ 0.2 million was reclassified to common stock in the prior period condensed consolidated balance sheets. Recent accounting pronouncements The following Accounting Standards Updates (ASUs) have been issued recently by the Financial Accounting Standards Board (FASB). ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures In November 2023, the FASB issued ASU 2023-07, which expands annual and interim reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. All disclosure requirements under the new guidance are also required for public entities with a single reportable segment. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. When adopted, the requirements will be applied retrospectively to all prior periods presented in the financial statements. We will adopt this ASU for the annual reporting period of our fiscal year beginning January 1, 2024, and for interim reporting periods of our fiscal year beginning January 1, 2025. We are currently evaluating the impact of applying this new accounting guidance to our financial statement disclosures. We do not expect the adoption of this ASU to have any material effects on the Company’s financial condition, results of operations, or cash flows. ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, which requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as information on income taxes paid. The standard is intended to benefit investors by providing more detailed income tax disclosures that would be useful in making capital allocation decisions. The ASU applies to all entities subject to income taxes. The new requirements will be effective for annual periods beginning after December 15, 2024. The guidance will be applied on a prospective basis with the option to apply the standard retrospectively. Early adoption is permitted. We plan to adopt this ASU for the annual reporting period of our fiscal year beginning January 1, 2025. We are evaluating the impact of applying this new accounting guidance to our income tax disclosures. We do not expect the adoption of this ASU to have any material effects on the Company’s financial condition, results of operations, or cash flows.

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 2 - Fair Value Measurement The following table summarizes the Company’s investments at September 30, 2024 and December 31, 2023 measured at fair value on a recurring basis (in thousands): September 30, 2024 December 31, 2023 Gross Gross Unrealized Recorded Unrealized Recorded (Losses) (Losses) Cost Gains Basis Cost Gains Basis Current: Cash equivalents: Money market funds $ 4,873 $ — $ 4,873 $ 19,539 $ — $ 19,539 Total cash equivalents 4,873 — 4,873 19,539 — 19,539 Investments: Corporate bonds 32,223 ( 2,092 ) 30,131 34,472 ( 3,159 ) 31,313 U.S. treasuries 20,380 ( 924 ) 19,456 12,448 ( 1,253 ) 11,195 U.S. government agency securities 12,758 ( 176 ) 12,582 12,830 ( 408 ) 12,422 Mortgage-backed securities 12,348 ( 2,115 ) 10,233 13,084 ( 2,454 ) 10,630 Asset-backed securities 7,622 ( 90 ) 7,532 13,659 ( 187 ) 13,472 Emerging markets — — — 2,003 ( 8 ) 1,995 Total current investments 85,331 ( 5,397 ) 79,934 88,496 ( 7,469 ) 81,027 Restricted cash and investments (1) : Corporate bonds 100,340 ( 6,037 ) 94,303 82,481 ( 8,454 ) 74,027 U.S. treasuries 65,028 ( 5,045 ) 59,983 109,020 ( 6,415 ) 102,605 Mortgage-backed securities 41,942 ( 4,309 ) 37,633 42,077 ( 5,216 ) 36,861 U.S. government agency securities 16,795 ( 706 ) 16,089 16,863 ( 1,199 ) 15,664 Mutual funds 10,745 — 10,745 8,941 — 8,941 Asset-backed securities 1,367 11 1,378 799 — 799 Emerging markets 200 9 209 200 2 202 Money market funds 99 — 99 337 — 337 Total restricted cash and 236,516 ( 16,077 ) 220,439 260,718 ( 21,282 ) 239,436 Total investments $ 326,720 $ ( 21,474 ) $ 305,246 $ 368,753 $ ( 28,751 ) $ 340,002 (1) Included in restricted cash and investments within the condensed consolidated balance sheets as of September 30, 2024 and December 31, 2023 is restricted cash of $ 3.4 million and $ 3.6 million, respectively, which is excluded from the table above. Restricted cash and investments are classified as current and noncurrent on the balance sheet based on the nature of the restriction. The following table summarizes the Company’s investments at September 30, 2024 and December 31, 2023 measured at fair value on a recurring basis by fair value hierarchy level (in thousands): September 30, 2024 December 31, 2023 Total Total Recorded Recorded Basis Level 1 Level 2 Other (1) Basis Level 1 Level 2 Other (1) Cash equivalents: Money market funds $ 4,873 $ — $ — $ 4,873 $ 19,539 $ — $ — $ 19,539 Investments: Corporate bonds 30,131 — 30,131 — 31,313 — 31,313 — U.S. treasuries 19,456 — 19,456 — 11,195 — 11,195 — U.S. government 12,582 — 12,582 — 12,422 — 12,422 — Mortgage-backed 10,233 — 10,233 — 10,630 — 10,630 — Asset-backed securities 7,532 — 7,532 — 13,472 — 13,472 — Emerging markets — — — — 1,995 — 1,995 — Restricted cash and Corporate bonds 94,303 — 94,303 — 74,027 — 74,027 — U.S. treasuries 59,983 — 59,983 — 102,605 — 102,605 — Mortgage-backed 37,633 — 37,633 — 36,861 — 36,861 — U.S. government 16,089 — 16,089 — 15,664 — 15,664 — Mutual funds 10,745 10,745 — — 8,941 8,941 — — Asset-backed securities 1,378 — 1,378 — 799 — 799 — Emerging markets 209 — 209 — 202 — 202 — Money market funds 99 — — 99 337 — — 337 Total investments $ 305,246 $ 10,745 $ 289,529 $ 4,972 $ 340,002 $ 8,941 $ 311,185 $ 19,876 (1) Investments in money market funds measured at fair value using the net asset value per share practical expedient are not subject to hierarchy level classification disclosure. The Company invests in money market funds that seek to maintain a stable net asset value. These investments include commingled funds that comprise high-quality short-term securities representing liquid debt and monetary instruments where the redemption value is likely to be the fair value. Redemption is permitted daily without written notice. The following table summarizes the contractual maturities of the Company’s available-for-sale securities at September 30, 2024 and December 31, 2023. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties. The table also includes money market funds, which are classified as cash and cash equivalents on the Company’s consolidated balance sheets. September 30, 2024 (In thousands) Less than Between 1 to Between 5 to After 10 Years Total Corporate bonds $ 22,767 $ 77,199 $ 24,293 $ 175 $ 124,434 U.S. treasuries 18,941 43,174 17,324 — 79,439 U.S. government agency securities 7,991 19,591 1,089 — 28,671 Asset-backed securities — 1,378 6,210 1,322 8,910 Money market funds 4,972 — — — 4,972 Emerging markets — — 209 — 209 Total $ 54,671 $ 141,342 $ 49,125 $ 1,497 $ 246,635 December 31, 2023 (In thousands) Less than Between 1 to Between 5 to After 10 Years Total U.S. treasuries $ 55,955 $ 32,706 $ 25,139 $ — $ 113,800 Corporate bonds 6,859 67,731 30,574 176 105,340 U.S. government agency securities 39 27,018 1,029 — 28,086 Money market funds 19,876 — — — 19,876 Asset-backed securities — 799 12,182 1,290 14,271 Emerging markets 1,995 — 202 — 2,197 Total $ 84,724 $ 128,254 $ 69,126 $ 1,466 $ 283,570 The average contractual maturity of mortgage-backed securities, which are excluded from the table above, was 22 and 23 years as of September 30, 2024 and December 31, 2023 , respectively.

Workers' Compensation Claims

Workers' Compensation Claims	9 Months Ended
	Sep. 30, 2024
Text Block [Abstract]
Workers' Compensation Claims	Note 3 – Workers’ Compensation Claims The following table summarizes the aggregate workers’ compensation reserve activity (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2024 2023 2024 2023 Beginning balance Workers' compensation claims liabilities $ 149,630 $ 191,823 $ 167,763 $ 215,987 Add: claims expense incurred Current period 2,358 3,792 9,657 11,636 Prior periods ( 4,272 ) ( 4,098 ) ( 9,094 ) ( 6,792 ) Total claims expense incurred ( 1,914 ) ( 306 ) 563 4,844 Less: claim payments related to Current period 1,063 1,240 3,582 2,005 Prior periods 9,493 12,244 27,716 41,532 Total claim payments 10,556 13,484 31,298 43,537 Change in claims incurred in excess of retention limits ( 357 ) ( 231 ) ( 225 ) 508 Ending balance Workers' compensation claims liabilities $ 136,803 $ 177,802 $ 136,803 $ 177,802 Insured program The Company provides workers’ compensation coverage for client employees primarily through arrangements with fully licensed, third-party insurers (the “insured program”). Under this program, carriers issue policies or afford coverage to the Company’s clients under a program maintained by the Company. Approximately 85 % of the Company’s workers’ compensation exposure is covered through the insured program. Effective July 1, 2021, the Company entered into a fully insured arrangement for its insured program, whereby third-party insurers assume substantially all risk of loss for claims incurred under the program. This fully insured arrangement has been extended annually and covers claims incurred between July 1, 2021 and June 30, 2025, with an option to renew through June 30, 2026. Each annual fully insured policy allows BBSI to participate in savings if claims develop favorably up to a maximum per policy year ranging from $ 20.5 million to $ 28.5 million, depending on the policy period. For only the policy period from July 1, 2021 to June 30 2022, BBSI can also incur additional premium up to $ 7.5 million if claims develop adversely. No additional premium can be charged based on claim performance for other policy years. Premiums incurred but not paid are recorded as either current or long-term premium payable on the consolidated balance sheets based on the expected timing of the payments. For claims incurred under the insured program prior to July 1, 2021, the Company retains risk of loss up to the first $ 3.0 million per occurrence on policies issued after June 30, 2020 and $ 5.0 million per occurrence on policies issued before that date. Claim obligations for policies issued under the insured program between February 1, 2014 and June 30, 2018 were removed through loss portfolio transfers in 2020 and 2021. The following is a summary of the risk retained by the Company under its insured program after considering the effects of the loss portfolio transfers and current insurance arrangements: Year Claims risk retained 2014 No 2015 No 2016 No 2017 No 2018 (1) No 2019 (1) Yes 2020 Yes 2021 - Through June 30 Yes 2021 - July 1 and after No 2022 No 2023 No 2024 No (1) The loss portfolio transfers excluded approximately 10 % of claims from 2018 and included an approximately offsetting amount of claims from 2019. The Company is required to maintain minimum collateral levels for certain policies issued under the insured program, which is held in a trust account (the “trust account”). The balance in the trust account was $ 189.3 million and $ 210.9 million at September 30, 2024 and December 31, 2023, respectively. The trust account balance is included as a component of the current and long-term restricted cash and investments in the Company’s condensed consolidated balance sheets. Self-insured programs The Company is a self-insured employer with respect to workers’ compensation coverage for all employees, including employees of PEO clients that elect to participate in our workers’ compensation program, working in Colorado, Maryland, Ohio, and Oregon. In the state of Washington, state law allows only the Company’s staffing services and internal management employees to be covered under the Company’s self-insured workers’ compensation program. The Company also operates a wholly owned, fully licensed insurance company, Ecole, which provides workers’ compensation coverage to client employees working in Arizona and Utah. Approximately 15 % of the Company’s workers’ compensation exposure is covered through self-insurance or Ecole (the “self-insured programs”). For all claims incurred under the Company’s self-insured programs, the Company retains risk of loss up to the first $ 3.0 million per occurrence, except in Maryland and Colorado, where the Company’s retention per occurrence is $ 1.0 million and $ 2.0 million, respectively. For claims incurred under the Company’s self-insured programs prior to July 1, 2020, the Company retains risk of loss up to the first $ 5.0 million per occurrence, except in Maryland and Colorado, where the retention per occurrence is $ 1.0 million and $ 2.0 million, respectively. The states of California, Maryland, Oregon, Washington, Colorado and Delaware required the Company to maintain collateral totaling $ 53.9 million and $ 48.1 million at September 30, 2024 and December 31, 2023 to cover potential workers’ compensation claims losses related to the Company’s current and former status as a self-insured employer. At September 30, 2024 , the Company provided surety bonds totaling $ 53.9 million. Claims liabilities The Company provided a total of $ 136.8 million and $ 167.8 million at September 30, 2024 and December 31, 2023 , respectively, as an estimated future liability for unsettled workers’ compensation claims liabilities. Of this amount, $ 5.8 million and $ 6.0 million at September 30, 2024 and December 31, 2023 , respectively, represent case reserves and IBNR in excess of the Company’s retention. The accrual for costs incurred in excess of retention is offset by a receivable from insurance carriers of $ 5.8 million and $ 6.0 million at September 30, 2024 and December 31, 2023 , respectively, included in other assets in the condensed consolidated balance sheets.

Revolving Credit Facility and L

Revolving Credit Facility and Long-Term Debt	9 Months Ended
	Sep. 30, 2024
Debt Disclosure [Abstract]
Revolving Credit Facility and Long-Term Debt	Note 4 - Revolving Credit Facility and Long-Term Debt The Company maintains an agreement (the “Agreement”) with Wells Fargo Bank, N.A. (the “Bank”) for a revolving credit line of $ 50.0 million and a sublimit for standby letters of credit of $ 25.0 million. Advances under the revolving credit line bear interest, as selected by the Company, of (a) the daily Simple Secured Overnight Financing Rate (“SOFR”) plus 1.75 % or (b) one-month Term SOFR plus 1.75 %. The Agreement also provides for an unused commitment fee of 0.35 % per year on the average daily unused amount of the revolving credit line, as well as a fee of 1.75 % of the face amount of each letter of credit reserved under the line of credit. The Company had no outstanding borrowings on its revolving credit line at September 30, 2024 and December 31, 2023. Th e credit facility is collateralized by the Company’s accounts receivable and other rights to receive payment. The revolving credit facility will mature on July 1, 2026 , unless extended. The Agreement requires the satisfaction of certain financial covenants as follows: • adjusted free cash flow [net profit after taxes plus interest expense (net of capitalized interest), depreciation expense, and amortization expense, less dividends/distributions] not less than $ 10 million as of each fiscal quarter end, determined on a rolling 4-quarter basis; and • tangible net worth [aggregate of total stockholders’ equity plus subordinated debt less any intangible assets and less any loans or advances to, or investments in, any related entities or individuals] not less than $ 50 million at each fiscal quarter end. The Agreement imposes certain additional restrictions unless the Bank provides its prior written consent as follows: • incurring additional indebtedness is prohibited, other than purchase financing for the acquisition of assets, provided that the aggregate of all purchase financing does not exceed $ 1 million at any time; • the Company may not terminate or cancel any of the AICE policies; and • if an event of default occurs and is continuing, including on a pro forma basis, no dividends or distributions would be permitted to be paid and redemptions and repurchases of the Company’s stock would be permitted only up to $ 15 million in any rolling 12-month period. The Agreement also contains customary events of default and specified cross-defaults under the Company’s workers’ compensation insurance arrangements. If an event of default under the Agreement occurs and is continuing, the Bank may declare any outstanding obligations under the Agreement to be immediately due and payable. At September 30, 2024 , the Company was in compliance with all covenants.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Note 5 – Income Taxes Under ASC 740, “Income Taxes,” management evaluates the realizability of the deferred tax assets on a quarterly basis under a “more-likely-than-not” standard. As part of this evaluation, management reviews all evidence both positive and negative to determine if a valuation allowance is needed. One component of this analysis is to determine whether the Company was in a cumulative loss position for the most recent 12 quarters. The Company was in a cumulative income position for the 12 quarters ended September 30, 2024 . At September 30, 2024 and December 31, 2023, the Company had no t recorded a valuation allowance against its deferred tax assets. The Company’s realization of a portion of net deferred tax assets is based in part on our estimates of the timing of reversals of certain temporary differences and on the generation of taxable income before such reversals. The Company is subject to income taxes in U.S. federal and multiple state and local tax jurisdictions. The Internal Revenue Service (the “IRS”) is examining the Company’s federal tax returns for the years ended December 31, 2017 through 2021 . BBSI received notices that the IRS intends to disallow certain wage-based tax credits claimed for the years 2017 through 2021 , which could result in estimated total additional taxes of $ 8.0 million and penalties of $ 1.9 million. The Company disagrees with the IRS determination to disallow certain wage-based credits taken by the Company and has filed a U.S. Tax Court petition challenging these notices. We believe that the Company has the technical merits to defend its position. Based on management’s more-likely-than-not assessment that the Company’s position is sustainable, no reserve for the aforementioned IRS notices of disallowance of wage-based tax credits or underpayment penalties has been recorded in the financial statements. In the major jurisdictions where it operates, the Company is generally no longer subject to income tax examinations by tax authorities for tax years before 2017. As of September 30, 2024 and December 31, 2023 , total gross unrecognized tax benefits, excluding interest and penalties, of $ 0.5 million and $ 0.8 million, respectively, would affect the Company ’s effective tax rate if recognized in future periods. The Company does not anticipate any material changes to the reserve in the next 12 months. A portion of the consolidated income the Company generates is not subject to state income tax. Depending on the percentage of this income as compared to total consolidated income, the Company's state effective tax rate could fluctuate from expectations. At September 30, 2024 , the Company had no state operating loss carryforwards. At September 30, 2024 , the Company did no t have a federal general business tax credit carryforward or an alternative minimum tax credit carryforward.

Litigation

Litigation	9 Months Ended
	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Litigation	Note 6 – Litigation On April 5, 2011, several individual plaintiffs filed a wage and hour class action in the California Superior Court, County of Fresno, naming as defendants their employer, a Merry Maids franchisee; BBSI, which was providing PEO services to the franchisee; and various parties related to the franchisor. Plaintiffs claimed, among other things, that BBSI and the franchisor were their joint employer with the franchisee and therefore jointly responsible for the alleged wage and hour violations. The case was subsequently removed to the United States District Court for the Eastern District of California, and on January 18, 2019, the District Court certified a class of former non-exempt employees who resided in California and worked for the franchisee in certain positions during the period from April 6, 2007 through January 19, 2019. On November 30, 2020, the District Court granted BBSI’s motion for summary judgment to be removed from the case. Thereafter the plaintiffs appealed to the United States Court of Appeals for the Ninth Circuit, and on June 2, 2022, the Court of Appeals reversed the order granting summary judgment to BBSI. The court held that there is a triable issue of fact concerning whether or not BBSI was a joint-employer under applicable California law. BBSI intends to vigorously defend the claim, including continuing to assert its defense on the ground that it was not a joint-employer of plaintiffs. Management is unable to estimate a range of reasonably possible loss due to various reasons, including: (1) certain aspects of discovery are ongoing; (2) the existence of a defense that, if successful, will eliminate the possibility of loss; and (3) there are significant factual and legal issues to be resolved. BBSI is subject to other legal proceedings and claims that arise in the ordinary course of our business. There are significant uncertainties surrounding litigation. For all other cases not discussed above, management has recorded an immaterial amount in other accrued liabilities in the condensed consolidated balance sheets.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2024
Subsequent Events [Abstract]
Subsequent Events	Note 7 – Subsequent Events We have evaluated events and transactions occurring after the balance sheet date through our filing date and noted no events that are subject to recognition or disclosure.

Basis of Presentation of Inte_2

Basis of Presentation of Interim Period Statements (Policies)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue recognition	Revenue recognition Professional employer (“PEO”) services are normally used by organizations to satisfy ongoing needs related to the management of human capital and are governed by the terms of a client services agreement which covers all employees at a particular work site. Staffing revenues relate primarily to short-term staffing, contract staffing and on-site management services. The Company’s performance obligations for PEO and staffing services are satisfied, and the related revenue is recognized, as services are rendered by our workforce. Our PEO client service agreements have a minimum term of one year , are renewable on an annual basis and typically require 30 days’ written notice to cancel or terminate the contract by either party. In addition, our client service agreements provide for immediate termination upon any payment default of the client regardless of when notice is given. PEO customers are invoiced following the end of each payroll processing cycle, with payment generally due on the invoice date. Staffing customers are generally invoiced weekly based on agreed rates per employee and actual hours worked, typically with payment terms of 30 days. The amount of earned but unbilled revenue is classified as a receivable on the condensed consolidated balance sheets. We report PEO revenues net of direct payroll costs because we are not the primary obligor for these payments to our clients’ employees. Direct payroll costs include salaries, wages, health insurance, and employee out-of-pocket expenses incurred incidental to employment.
Cost of revenues	Cost of revenues Our cost of revenues for PEO services includes employer payroll-related taxes, workers’ compensation costs and employee benefits costs. Our cost of revenues for staffing services includes direct payroll costs, employer payroll-related taxes, and workers’ compensation costs. Direct payroll costs represent the gross payroll earned by staffing services employees based on salary or hourly wages. Payroll taxes consist of the employer’s portion of Social Security and Medicare taxes and federal and state unemployment taxes. Benefit costs primarily comprise health insurance premiums paid to third-party carriers as part of our fully insured PEO benefits programs and underwriting and benefit consultant payroll. Workers’ compensation costs consist primarily of premiums paid to third-party insurers, claims reserves, claims administration fees, legal fees, medical cost containment (“MCC”) expense, state administrative agency fees, third-party broker commissions, and risk manager payroll, as well as costs associated with operating our two wholly owned insurance companies, Associated Insurance Company for Excess (“AICE”) and Ecole Insurance Company (“Ecole”).
Cash and cash equivalents	Cash and cash equivalents We consider non-restricted short-term investments that are highly liquid, readily convertible into cash, and have maturities at acquisition of less than three months to be cash equivalents for purposes of the condensed consolidated statements of cash flows and condensed consolidated balance sheets. The Company maintains cash balances in bank accounts that normally exceed FDIC insured limits. The Company has not experienced any losses related to its cash concentration.
Investments	Investments The Company classifies investments as available-for-sale. The Company’s investments are reported at fair value with unrealized gains and losses, net of taxes, shown as a component of accumulated other comprehensive loss in stockholders’ equity. Investments are recorded as current on the condensed consolidated balance sheets as the invested funds are available for current operations. Management considers available evidence in evaluating potential impairment of investments, including the extent to which fair value is less than cost and adverse conditions related to the security. In the event of a credit loss, an allowance would be recognized to the extent that the fair value of the security is less than the present value of the expected future cash flows. Realized gains and losses on sales of investments are included in investment income in our condensed consolidated statements of operations.
Restricted cash and investments	Restricted cash and investments The Company holds restricted cash and investments primarily for the future payment of insurance premiums and workers’ compensation claims. These investments are categorized as available-for-sale. They are reported at fair value with unrealized gains and losses, net of taxes, shown as a component of accumulated other comprehensive loss in stockholders’ equity. Restricted cash and investments are classified as current and noncurrent on the condensed consolidated balance sheets based on the nature of the restriction. Management considers available evidence in evaluating potential impairment of restricted investments, including the extent to which fair value is less than cost and adverse conditions related to the security. In the event of a credit loss, an allowance would be recognized to the extent that the fair value of the security is less than the present value of the expected future cash flows. Realized gains and losses on sales of restricted investments are included in investment income in our condensed consolidated statements of operations. Restricted cash and investments also includes investments held as part of the Company’s deferred compensation plan. These investments are classified as trading securities and are recorded at fair value with unrealized gains and losses reported as a component of income from operations.
Allowance for expected credit losses	Allowance for expected credit losses The Company had an allowance for expected credit losses of $ 0.9 million at September 30, 2024 and December 31, 2023 . We make estimates of the collectability of our accounts receivable for services provided to our customers based on future expected credit losses. Management analyzes historical bad debts, customer concentrations, customer credit-worthiness, current economic trends and changes in customers’ payment trends when evaluating the adequacy of the allowance for expected credit losses. If the financial condition of our customers deteriorates resulting in an impairment of their ability to make payments, additional allowances may be required.
Workers' compensation claims liabilities	Workers’ compensation claims liabilities Our workers’ compensation claims liabilities do not represent an exact calculation of liability but rather management’s best estimate, utilizing actuarial expertise and projection techniques, at a given reporting date. The estimated liability for open workers’ compensation claims is based on an evaluation of information provided by our third-party administrator for workers’ compensation claims, coupled with an actuarial estimate of future loss development with respect to reported claims and incurred but not reported claims (together, “IBNR”). Workers’ compensation claims liabilities include case reserve estimates for reported losses, plus additional amounts for estimated IBNR claims, MCC and legal costs, unallocated loss adjustment expenses and estimated future recoveries. The estimate of incurred costs expected to be paid within one year is included in current liabilities, while the estimate of incurred costs expected to be paid beyond one year is included in long-term liabilities on our condensed consolidated balance sheets. These estimates are reviewed at least quarterly and adjustments to estimated liabilities are reflected in current operating results as they become known. The process of arriving at an estimate of unpaid claims and claims adjustment expense involves a high degree of judgment and is affected by both internal and external events, including changes in claims handling practices, changes in reserve estimation procedures, inflation, trends in the litigation and settlement of pending claims, and legislative changes. Our estimates are based on actuarial analysis and informed judgment, derived from individual experience and expertise applied to multiple sets of data and analyses. We consider significant facts and circumstances known both at the time that loss reserves are initially established and as new facts and circumstances become known. Due to the inherent uncertainty underlying loss reserve estimates, the expenses incurred through final resolution of our liability for our workers’ compensation claims will likely vary from the related loss reserves at the reporting date. Therefore, as specific claims are paid out in the future, actual paid losses may be materially different from our current loss reserves. A basic premise in most actuarial analyses is that historical data and past patterns demonstrated in the incurred and paid historical data form a reasonable basis upon which to project future outcomes, absent a material change. Significant structural changes to the available data can materially impact the reserve estimation process. To the extent a material change affecting the ultimate claim liability becomes known, such change is quantified to the extent possible through an analysis of internal Company data and, if available and when appropriate, external data. Nonetheless, actuaries exercise a considerable degree of judgment in the evaluation of these factors and the need for such actuarial judgment is more pronounced when faced with material uncertainties.
Customer deposits	Customer deposits We require deposits from certain PEO customers to cover a portion of our accounts receivable due from such customers in the event of default of payment.
Comprehensive income	Comprehensive income Comprehensive income includes all changes in equity during a period except those that resulted from investments by or distributions to the Company’s stockholders. Other comprehensive income refers to revenues, expenses, gains and losses that under GAAP are included in comprehensive income, but excluded from net income as these amounts are recorded directly as an adjustment to stockholders’ equity. Our other comprehensive income comprises unrealized holding gains and losses on our available-for-sale investments.
Statements of cash flows	Statements of cash flows Interest paid during the nine months ended September 30, 2024 and 2023 did not materially differ from interest expense. Income taxes paid by the Company during the nine months ended September 30, 2024 and 2023 totaled $ 8.0 m illion and $ 13.0 mil lion, respectively. Bank deposits and other cash equivalents that are restricted for use are classified as restricted cash. The table below reconciles the cash, cash equivalents and restricted cash balances from our condensed consolidated balance sheets to the amounts reported on the condensed consolidated statements of cash flows (in thousands): September 30, December 31, September 30, December 31, 2024 2023 2023 2022 Cash and cash equivalents $ 14,429 $ 71,168 $ 41,579 $ 91,423 Restricted cash, included in restricted cash and 14,286 3,673 20,857 15,955 Total cash, cash equivalents and restricted cash $ 28,715 $ 74,841 $ 62,436 $ 107,378
Basic and diluted earnings per share	Basic and diluted earnings per share Basic earnings per share are computed based on the weighted average number of common shares outstanding for each year using the treasury method. Diluted earnings per share reflect the potential effects of the issuance of shares in connection with the exercise of outstanding stock options, vesting of outstanding restricted stock units and performance share units, and the Company’s employee stock purchase plan. Basic and diluted shares outstanding adjusted to reflect the 2024 Stock Split are summarized as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2024 2023 2024 2023 Weighted average number of basic shares outstanding 26,052 26,795 26,133 27,088 Effect of dilutive securities 568 387 603 453 Weighted average number of diluted shares outstanding 26,620 27,182 26,736 27,541
Accounting estimates	Accounting estimates The preparation of our condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions. These affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements, and the reported amounts of revenues and expenses during the reporting periods. Management bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Estimates are used for fair value measurement of investments, allowance for expected credit losses, deferred income taxes, carrying values for goodwill and property, equipment and software, and accrued workers’ compensation liabilities. Actual results may or may not differ from such estimates.
Reclassifications	Reclassifications To conform to the current period’s presentation, safety incentives liability of $ 1.3 million was reclassified to other accrued liabilities in the prior period condensed consolidated balance sheets, and net cash outflows related to safety incentives liability of $ 0.6 million was reclassified to other accrued liabilities in the prior period condensed consolidated statements of cash flows. All share and per share amounts presented herein have been retroactively adjusted to reflect the impact of the 2024 Stock Split. To conform to the current period’s presentation, additional paid-in-capital of $ 0.2 million was reclassified to common stock in the prior period condensed consolidated balance sheets.
Recent accounting pronouncements	Recent accounting pronouncements The following Accounting Standards Updates (ASUs) have been issued recently by the Financial Accounting Standards Board (FASB). ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures In November 2023, the FASB issued ASU 2023-07, which expands annual and interim reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. All disclosure requirements under the new guidance are also required for public entities with a single reportable segment. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. When adopted, the requirements will be applied retrospectively to all prior periods presented in the financial statements. We will adopt this ASU for the annual reporting period of our fiscal year beginning January 1, 2024, and for interim reporting periods of our fiscal year beginning January 1, 2025. We are currently evaluating the impact of applying this new accounting guidance to our financial statement disclosures. We do not expect the adoption of this ASU to have any material effects on the Company’s financial condition, results of operations, or cash flows. ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, which requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as information on income taxes paid. The standard is intended to benefit investors by providing more detailed income tax disclosures that would be useful in making capital allocation decisions. The ASU applies to all entities subject to income taxes. The new requirements will be effective for annual periods beginning after December 15, 2024. The guidance will be applied on a prospective basis with the option to apply the standard retrospectively. Early adoption is permitted. We plan to adopt this ASU for the annual reporting period of our fiscal year beginning January 1, 2025. We are evaluating the impact of applying this new accounting guidance to our income tax disclosures. We do not expect the adoption of this ASU to have any material effects on the Company’s financial condition, results of operations, or cash flows.

Basis of Presentation of Inte_3

Basis of Presentation of Interim Period Statements (Tables)	9 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Reconciles of Cash, Cash Equivalents and Restricted Cash Balances	The table below reconciles the cash, cash equivalents and restricted cash balances from our condensed consolidated balance sheets to the amounts reported on the condensed consolidated statements of cash flows (in thousands): September 30, December 31, September 30, December 31, 2024 2023 2023 2022 Cash and cash equivalents $ 14,429 $ 71,168 $ 41,579 $ 91,423 Restricted cash, included in restricted cash and 14,286 3,673 20,857 15,955 Total cash, cash equivalents and restricted cash $ 28,715 $ 74,841 $ 62,436 $ 107,378
Summary of Basic and Diluted Common Shares Outstanding	Basic and diluted shares outstanding adjusted to reflect the 2024 Stock Split are summarized as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2024 2023 2024 2023 Weighted average number of basic shares outstanding 26,052 26,795 26,133 27,088 Effect of dilutive securities 568 387 603 453 Weighted average number of diluted shares outstanding 26,620 27,182 26,736 27,541

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Summary of Investments Measured at Fair Value on Recurring Basis	The following table summarizes the Company’s investments at September 30, 2024 and December 31, 2023 measured at fair value on a recurring basis (in thousands): September 30, 2024 December 31, 2023 Gross Gross Unrealized Recorded Unrealized Recorded (Losses) (Losses) Cost Gains Basis Cost Gains Basis Current: Cash equivalents: Money market funds $ 4,873 $ — $ 4,873 $ 19,539 $ — $ 19,539 Total cash equivalents 4,873 — 4,873 19,539 — 19,539 Investments: Corporate bonds 32,223 ( 2,092 ) 30,131 34,472 ( 3,159 ) 31,313 U.S. treasuries 20,380 ( 924 ) 19,456 12,448 ( 1,253 ) 11,195 U.S. government agency securities 12,758 ( 176 ) 12,582 12,830 ( 408 ) 12,422 Mortgage-backed securities 12,348 ( 2,115 ) 10,233 13,084 ( 2,454 ) 10,630 Asset-backed securities 7,622 ( 90 ) 7,532 13,659 ( 187 ) 13,472 Emerging markets — — — 2,003 ( 8 ) 1,995 Total current investments 85,331 ( 5,397 ) 79,934 88,496 ( 7,469 ) 81,027 Restricted cash and investments (1) : Corporate bonds 100,340 ( 6,037 ) 94,303 82,481 ( 8,454 ) 74,027 U.S. treasuries 65,028 ( 5,045 ) 59,983 109,020 ( 6,415 ) 102,605 Mortgage-backed securities 41,942 ( 4,309 ) 37,633 42,077 ( 5,216 ) 36,861 U.S. government agency securities 16,795 ( 706 ) 16,089 16,863 ( 1,199 ) 15,664 Mutual funds 10,745 — 10,745 8,941 — 8,941 Asset-backed securities 1,367 11 1,378 799 — 799 Emerging markets 200 9 209 200 2 202 Money market funds 99 — 99 337 — 337 Total restricted cash and 236,516 ( 16,077 ) 220,439 260,718 ( 21,282 ) 239,436 Total investments $ 326,720 $ ( 21,474 ) $ 305,246 $ 368,753 $ ( 28,751 ) $ 340,002 (1) Included in restricted cash and investments within the condensed consolidated balance sheets as of September 30, 2024 and December 31, 2023 is restricted cash of $ 3.4 million and $ 3.6 million, respectively, which is excluded from the table above. Restricted cash and investments are classified as current and noncurrent on the balance sheet based on the nature of the restriction.
Summary of Assets Measured at Fair Value on Recurring Basis	The following table summarizes the Company’s investments at September 30, 2024 and December 31, 2023 measured at fair value on a recurring basis by fair value hierarchy level (in thousands): September 30, 2024 December 31, 2023 Total Total Recorded Recorded Basis Level 1 Level 2 Other (1) Basis Level 1 Level 2 Other (1) Cash equivalents: Money market funds $ 4,873 $ — $ — $ 4,873 $ 19,539 $ — $ — $ 19,539 Investments: Corporate bonds 30,131 — 30,131 — 31,313 — 31,313 — U.S. treasuries 19,456 — 19,456 — 11,195 — 11,195 — U.S. government 12,582 — 12,582 — 12,422 — 12,422 — Mortgage-backed 10,233 — 10,233 — 10,630 — 10,630 — Asset-backed securities 7,532 — 7,532 — 13,472 — 13,472 — Emerging markets — — — — 1,995 — 1,995 — Restricted cash and Corporate bonds 94,303 — 94,303 — 74,027 — 74,027 — U.S. treasuries 59,983 — 59,983 — 102,605 — 102,605 — Mortgage-backed 37,633 — 37,633 — 36,861 — 36,861 — U.S. government 16,089 — 16,089 — 15,664 — 15,664 — Mutual funds 10,745 10,745 — — 8,941 8,941 — — Asset-backed securities 1,378 — 1,378 — 799 — 799 — Emerging markets 209 — 209 — 202 — 202 — Money market funds 99 — — 99 337 — — 337 Total investments $ 305,246 $ 10,745 $ 289,529 $ 4,972 $ 340,002 $ 8,941 $ 311,185 $ 19,876 (1) Investments in money market funds measured at fair value using the net asset value per share practical expedient are not subject to hierarchy level classification disclosure. The Company invests in money market funds that seek to maintain a stable net asset value. These investments include commingled funds that comprise high-quality short-term securities representing liquid debt and monetary instruments where the redemption value is likely to be the fair value. Redemption is permitted daily without written notice.
Summary of Contractual Maturities of Available for Sale Securities	The following table summarizes the contractual maturities of the Company’s available-for-sale securities at September 30, 2024 and December 31, 2023. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties. The table also includes money market funds, which are classified as cash and cash equivalents on the Company’s consolidated balance sheets. September 30, 2024 (In thousands) Less than Between 1 to Between 5 to After 10 Years Total Corporate bonds $ 22,767 $ 77,199 $ 24,293 $ 175 $ 124,434 U.S. treasuries 18,941 43,174 17,324 — 79,439 U.S. government agency securities 7,991 19,591 1,089 — 28,671 Asset-backed securities — 1,378 6,210 1,322 8,910 Money market funds 4,972 — — — 4,972 Emerging markets — — 209 — 209 Total $ 54,671 $ 141,342 $ 49,125 $ 1,497 $ 246,635 December 31, 2023 (In thousands) Less than Between 1 to Between 5 to After 10 Years Total U.S. treasuries $ 55,955 $ 32,706 $ 25,139 $ — $ 113,800 Corporate bonds 6,859 67,731 30,574 176 105,340 U.S. government agency securities 39 27,018 1,029 — 28,086 Money market funds 19,876 — — — 19,876 Asset-backed securities — 799 12,182 1,290 14,271 Emerging markets 1,995 — 202 — 2,197 Total $ 84,724 $ 128,254 $ 69,126 $ 1,466 $ 283,570

Workers' Compensation Claims (T

Workers' Compensation Claims (Tables)	9 Months Ended
	Sep. 30, 2024
Text Block [Abstract]
Summarizes Aggregate Workers' Compensation Reserve Activity	The following table summarizes the aggregate workers’ compensation reserve activity (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2024 2023 2024 2023 Beginning balance Workers' compensation claims liabilities $ 149,630 $ 191,823 $ 167,763 $ 215,987 Add: claims expense incurred Current period 2,358 3,792 9,657 11,636 Prior periods ( 4,272 ) ( 4,098 ) ( 9,094 ) ( 6,792 ) Total claims expense incurred ( 1,914 ) ( 306 ) 563 4,844 Less: claim payments related to Current period 1,063 1,240 3,582 2,005 Prior periods 9,493 12,244 27,716 41,532 Total claim payments 10,556 13,484 31,298 43,537 Change in claims incurred in excess of retention limits ( 357 ) ( 231 ) ( 225 ) 508 Ending balance Workers' compensation claims liabilities $ 136,803 $ 177,802 $ 136,803 $ 177,802
Summary of Risk Retained by Insured Program after Considering Loss Portfolio Transfers and Current Insurance Arrangements	The following is a summary of the risk retained by the Company under its insured program after considering the effects of the loss portfolio transfers and current insurance arrangements: Year Claims risk retained 2014 No 2015 No 2016 No 2017 No 2018 (1) No 2019 (1) Yes 2020 Yes 2021 - Through June 30 Yes 2021 - July 1 and after No 2022 No 2023 No 2024 No (1) The loss portfolio transfers excluded approximately 10 % of claims from 2018 and included an approximately offsetting amount of claims from 2019.

Basis of Presentation of Inte_4

Basis of Presentation of Interim Period Statements - Additional Information (Detail) $ / shares in Units, $ in Millions			6 Months Ended	9 Months Ended		12 Months Ended
	Jun. 04, 2024 $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Jun. 30, 2024	Sep. 30, 2024 USD ($) Company $ / shares shares	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares shares	Jun. 03, 2024 shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Stock split, description				On June 4, 2024, we amended our Charter to increase the number of authorized shares of common stock from 20,500,000 shares to 82,000,000 shares, and our Board of Directors declared a four-for-one split of the Company’s common stock effected in the form of a stock dividend (the “2024 Stock Split”). Each stockholder of record at the close of business on June 14, 2024 received a dividend of three additional shares of common stock for each then-held share, distributed after close of trading on June 21, 2024.
Common stock, shares authorized | shares	82,000,000	82,000,000		82,000,000		82,000,000	20,500,000
Stock split, conversion ratio	0.25		0.25	0.25
Common stock, par value | $ / shares	$ 0.01	$ 0.01		$ 0.01		$ 0.01
Revenue recognition professional employer service contracts term				1 year
Professional employer service contract cancellation and termination period				30 days
Payment term for staffing customers				30 days
Number of wholly-owned insurance companies | Company				2
Cash and cash equivalents, maturity term				3 months
Allowance for expected credit losses		$ 0.9		$ 0.9		$ 0.9
Income taxes paid				8	$ 13
Prior period reclassification adjustment		$ 1.3		$ 0.6		$ 0.2

Basis of Presentation of Inte_5

Basis of Presentation of Interim Period Statements - Schedule of Reconciles of Cash, Cash Equivalents and Restricted Cash Balances (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 14,429	$ 71,168	$ 41,579	$ 91,423
Restricted cash, included in restricted cash and investments	14,286	3,673	20,857	15,955
Total cash, cash equivalents and restricted cash shown in the statements of cash flows	$ 28,715	$ 74,841	$ 62,436	$ 107,378

Basis of Presentation of Inte_6

Basis of Presentation of Interim Period Statements - Summary of Basic and Diluted Common Shares Outstanding (Detail) - shares shares in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average number of basic shares outstanding	[1]	26,052	26,795	26,133	27,088
Effect of dilutive securities		568	387	603	453
Weighted average number of diluted shares outstanding	[1]	26,620	27,182	26,736	27,541
[1] Prior period results have been adjusted to reflect the four -for-one stock split effected in the form of a stock dividend in June 2024. See Note 1, Basis of Presentation of Interim Period Statements for details.

Fair Value Measurement - Summar

Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	$ 326,720	$ 368,753
Gross Unrealized (Losses) Gains	(21,474)	(28,751)
Recorded Basis	305,246	340,002
Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	4,873	19,539
Recorded Basis	4,873	19,539
Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	85,331	88,496
Gross Unrealized (Losses) Gains	(5,397)	(7,469)
Recorded Basis	79,934	81,027
Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	236,516	260,718
Gross Unrealized (Losses) Gains	(16,077)	(21,282)
Recorded Basis	220,439	239,436
Money Market Funds [Member] | Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	4,873	19,539
Recorded Basis	4,873	19,539
Money Market Funds [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	99	337
Recorded Basis	99	337
Corporate Bonds [Member] | Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	32,223	34,472
Gross Unrealized (Losses) Gains	(2,092)	(3,159)
Recorded Basis	30,131	31,313
Corporate Bonds [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	100,340	82,481
Gross Unrealized (Losses) Gains	(6,037)	(8,454)
Recorded Basis	94,303	74,027
U.S. Treasuries [Member] | Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	20,380	12,448
Gross Unrealized (Losses) Gains	(924)	(1,253)
Recorded Basis	19,456	11,195
U.S. Treasuries [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	65,028	109,020
Gross Unrealized (Losses) Gains	(5,045)	(6,415)
Recorded Basis	59,983	102,605
U.S. Government Agency Securities [Member] | Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	12,758	12,830
Gross Unrealized (Losses) Gains	(176)	(408)
Recorded Basis	12,582	12,422
U.S. Government Agency Securities [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	16,795	16,863
Gross Unrealized (Losses) Gains	(706)	(1,199)
Recorded Basis	16,089	15,664
Mortgage Backed Securities [Member] | Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	12,348	13,084
Gross Unrealized (Losses) Gains	(2,115)	(2,454)
Recorded Basis	10,233	10,630
Mortgage Backed Securities [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	41,942	42,077
Gross Unrealized (Losses) Gains	(4,309)	(5,216)
Recorded Basis	37,633	36,861
Asset Backed Securities [Member] | Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	7,622	13,659
Gross Unrealized (Losses) Gains	(90)	(187)
Recorded Basis	7,532	13,472
Asset Backed Securities [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	1,367	799
Gross Unrealized (Losses) Gains	11
Recorded Basis	1,378	799
Emerging Markets [Member] | Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost		2,003
Gross Unrealized (Losses) Gains		(8)
Recorded Basis		1,995
Emerging Markets [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	200	200
Gross Unrealized (Losses) Gains	9	2
Recorded Basis	209	202
Mutual Funds [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	10,745	8,941
Recorded Basis	$ 10,745	$ 8,941

Fair Value Measurement - Summ_2

Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Restricted cash	$ 3.4	$ 3.6

Fair Value Measurement - Summ_3

Fair Value Measurement - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	$ 305,246	$ 340,002
Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	4,972	19,876
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	10,745	8,941
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	289,529	311,185
Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	4,873	19,539
Cash and Cash Equivalents [Member] | Money Market Funds [Member] | Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	4,873	19,539
Investments [Member] | Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	30,131	31,313
Investments [Member] | Corporate Bonds [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	30,131	31,313
Investments [Member] | U.S. Treasuries [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	19,456	11,195
Investments [Member] | U.S. Treasuries [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	19,456	11,195
Investments [Member] | U.S. Government Agency Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	12,582	12,422
Investments [Member] | U.S. Government Agency Securities [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	12,582	12,422
Investments [Member] | Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	10,233	10,630
Investments [Member] | Mortgage Backed Securities [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	10,233	10,630
Investments [Member] | Asset Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	7,532	13,472
Investments [Member] | Asset Backed Securities [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	7,532	13,472
Investments [Member] | Emerging Markets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis		1,995
Investments [Member] | Emerging Markets [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis		1,995
Restricted Cash and Investments [Member] | Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	99	337
Restricted Cash and Investments [Member] | Money Market Funds [Member] | Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	99	337
Restricted Cash and Investments [Member] | Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	94,303	74,027
Restricted Cash and Investments [Member] | Corporate Bonds [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	94,303	74,027
Restricted Cash and Investments [Member] | U.S. Treasuries [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	59,983	102,605
Restricted Cash and Investments [Member] | U.S. Treasuries [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	59,983	102,605
Restricted Cash and Investments [Member] | U.S. Government Agency Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	16,089	15,664
Restricted Cash and Investments [Member] | U.S. Government Agency Securities [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	16,089	15,664
Restricted Cash and Investments [Member] | Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	37,633	36,861
Restricted Cash and Investments [Member] | Mortgage Backed Securities [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	37,633	36,861
Restricted Cash and Investments [Member] | Asset Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	1,378	799
Restricted Cash and Investments [Member] | Asset Backed Securities [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	1,378	799
Restricted Cash and Investments [Member] | Emerging Markets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	209	202
Restricted Cash and Investments [Member] | Emerging Markets [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	209	202
Restricted Cash and Investments [Member] | Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	10,745	8,941
Restricted Cash and Investments [Member] | Mutual Funds [Member] | Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	$ 10,745	$ 8,941

Fair Value Measurement - Summ_4

Fair Value Measurement - Summary of Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	$ 54,671	$ 84,724
Available for sale securities, contractual maturities between 1 to 5 years	141,342	128,254
Available for sale securities, contractual maturities between 5 to 10 years	49,125	69,126
Available for sale securities, contractual maturities after 10 years	1,497	1,466
Available for sale securities, contractual maturities, Total	246,635	283,570
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	22,767	6,859
Available for sale securities, contractual maturities between 1 to 5 years	77,199	67,731
Available for sale securities, contractual maturities between 5 to 10 years	24,293	30,574
Available for sale securities, contractual maturities after 10 years	175	176
Available for sale securities, contractual maturities, Total	124,434	105,340
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	18,941	55,955
Available for sale securities, contractual maturities between 1 to 5 years	43,174	32,706
Available for sale securities, contractual maturities between 5 to 10 years	17,324	25,139
Available for sale securities, contractual maturities, Total	79,439	113,800
U.S. Government Agency Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	7,991	39
Available for sale securities, contractual maturities between 1 to 5 years	19,591	27,018
Available for sale securities, contractual maturities between 5 to 10 years	1,089	1,029
Available for sale securities, contractual maturities, Total	28,671	28,086
Asset Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities between 1 to 5 years	1,378	799
Available for sale securities, contractual maturities between 5 to 10 years	6,210	12,182
Available for sale securities, contractual maturities after 10 years	1,322	1,290
Available for sale securities, contractual maturities, Total	8,910	14,271
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	4,972	19,876
Available for sale securities, contractual maturities, Total	4,972	19,876
Emerging Markets [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year		1,995
Available for sale securities, contractual maturities between 5 to 10 years	209	202
Available for sale securities, contractual maturities, Total	$ 209	$ 2,197

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Average contractual maturity period	22 years	23 years
Investment, Type [Extensible Enumeration]	Collateralized Mortgage-Backed Securities [Member]	Collateralized Mortgage-Backed Securities [Member]

Workers' Compensation Claims -

Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Workers Compensation Reserve [Abstract]
Workers' compensation claims liabilities, Beginning balance	$ 149,630	$ 191,823	$ 167,763	$ 215,987
Add: claims expense accrual
Current period	2,358	3,792	9,657	11,636
Prior periods	(4,272)	(4,098)	(9,094)	(6,792)
Total claims expense incurred	(1,914)	(306)	563	4,844
Less: claim payments related to
Current period	1,063	1,240	3,582	2,005
Prior periods	9,493	12,244	27,716	41,532
Total claim payments	10,556	13,484	31,298	43,537
Change in claims incurred in excess of retention limits	(357)	(231)	(225)	508
Workers' compensation claims liabilities, Ending balance	$ 136,803	$ 177,802	$ 136,803	$ 177,802

Workers' Compensation Claims _2

Workers' Compensation Claims - Additional Information (Detail) - USD ($)			6 Months Ended	9 Months Ended	12 Months Ended	39 Months Ended
	Jul. 01, 2021	Jun. 29, 2020	Jun. 30, 2020	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Description of renewed agreement						Effective July 1, 2021, the Company entered into a fully insured arrangement for its insured program, whereby third-party insurers assume substantially all risk of loss for claims incurred under the program. This fully insured arrangement has been extended annually and covers claims incurred between July 1, 2021 and June 30, 2025, with an option to renew through June 30, 2026.Each annual fully insured policy allows BBSI to participate in savings if claims develop favorably up to a maximum per policy year ranging from $20.5 million to $28.5 million, depending on the policy period. For only the policy period from July 1, 2021 to June 30 2022, BBSI can also incur additional premium up to $7.5 million if claims develop adversely. No additional premium can be charged based on claim performance for other policy years.Premiums incurred but not paid are recorded as either current or long-term premium payable on the consolidated balance sheets based on the expected timing of the payments.
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely				$ 0
Balance in Chubb trust accounts				189,300,000	$ 210,900,000	$ 189,300,000
Workers compensation liability				136,803,000	167,763,000	136,803,000	$ 149,630,000	$ 177,802,000	$ 191,823,000	$ 215,987,000
Collateral securities maintain to cover potential workers compensation claims losses				53,900,000	48,100,000	53,900,000
Surety bonds and standby letters of credit				53,900,000		53,900,000
Reserves and IBNR in excess of retention limits incurred but not reported				5,800,000	6,000,000
2021-2022 Policy [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely				7,500,000
2021-2022 Policy [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum savings amount for twelve month policy period, if claims develop favorably				28,500,000
2021-2022 Policy [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum savings amount for twelve month policy period, if claims develop favorably				20,500,000
2022-2023 Policy [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum savings amount for twelve month policy period, if claims develop favorably				28,500,000
2022-2023 Policy [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum savings amount for twelve month policy period, if claims develop favorably				20,500,000
2023-2024 Policy [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum savings amount for twelve month policy period, if claims develop favorably				28,500,000
2023-2024 Policy [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum savings amount for twelve month policy period, if claims develop favorably				20,500,000
Other Assets [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrual for costs incurred in excess of retention limits offset by a receivable				$ 5,800,000	$ 6,000,000	5,800,000
Self Insured Programs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of worker's compensation exposure covered				15%
Worker's compensation risk claim maximum			$ 5,000,000	$ 3,000,000
Self Insured Programs [Member] | Maryland [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reinsurance coverage			1,000,000	1,000,000		1,000,000
Self Insured Programs [Member] | Colorado [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reinsurance coverage			$ 2,000,000	$ 2,000,000		$ 2,000,000
Insured Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of worker's compensation exposure covered				85%
Worker's compensation risk claim maximum	$ 3,000,000
Worker's compensation risk claim maximum		$ 5,000,000

Worker's Compensation Claims -

Worker's Compensation Claims - Summary of Risk Retained by Insured Program after Considering Loss Portfolio Transfers and Current Insurance Arrangements (Details)	9 Months Ended
	Sep. 30, 2024
2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	Yes
2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	Yes
2021 - Through June 30 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	Yes
2021 - July 1 and After [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2022 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No
2024 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Claims risk retained	No

Worker's Compensation Claims _2

Worker's Compensation Claims - Summary of Risk Retained by Insured Program after Considering Loss Portfolio Transfers and Current Insurance Arrangements (Parenthetical) (Details)	9 Months Ended
	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Percentage of claim excluded	10%

Revolving Credit Facility and_2

Revolving Credit Facility and Long-Term Debt - Additional Information (Detail) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2024
Line of Credit Facility [Line Items]
Line of credit facility commitment fee description					The Agreement also provides for an unused commitment fee of 0.35% per year on the average daily unused amount of the revolving credit line, as well as a fee of 1.75% of the face amount of each letter of credit reserved under the line of credit.
Agreement [Member]
Line of Credit Facility [Line Items]
Outstanding balance on term loan and revolving credit facility	$ 0			$ 0	$ 0
Dividends or distributions paid					0
Maximum amount to redeem retire repurchase or acquire stock upon agreement					15,000,000
Minimum [Member]
Line of Credit Facility [Line Items]
Tangible net worth amount	50,000,000	$ 50,000,000	$ 50,000,000	50,000,000
Minimum [Member] | Agreement [Member]
Line of Credit Facility [Line Items]
EBITDA	10,000,000	$ 10,000,000	$ 10,000,000	$ 10,000,000	10,000,000
Maximum [Member] | Agreement [Member]
Line of Credit Facility [Line Items]
Prohibition on incurring additional indebtedness without the prior approval of the Bank in purchase money financing					$ 1,000,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maturity date					Jul. 01, 2026
Revolving Credit Facility [Member] | Agreement [Member]
Line of Credit Facility [Line Items]
Credit facility borrowing capacity	50,000,000				$ 50,000,000
Unused commitment fee on unused amount during period					0.35%
Revolving Credit Facility [Member] | SOFR [Member]
Line of Credit Facility [Line Items]
Term loan from bank interest rate description					the daily Simple Secured Overnight Financing Rate (“SOFR”) plus 1.75% or (b) one-month Term SOFR plus 1.75%.
Revolving Credit Facility [Member] | SOFR [Member] | Agreement [Member]
Line of Credit Facility [Line Items]
SOFR plus rate					1.75%
Revolving Credit Facility [Member] | One-Month Term SOFR [Member]
Line of Credit Facility [Line Items]
Term loan from bank interest rate description					one-month Term SOFR plus 1.75
SOFR plus rate					1.75%
Standby Letters of Credit [Member] | Agreement [Member]
Line of Credit Facility [Line Items]
Credit facility borrowing capacity	$ 25,000,000				$ 25,000,000
Line of Credit [Member] | Agreement [Member]
Line of Credit Facility [Line Items]
Unused commitment fee on unused amount					1.75%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	9 Months Ended	60 Months Ended
	Sep. 30, 2024	Dec. 31, 2021	Dec. 31, 2023
Income Tax Contingency [Line Items]
Deferred tax assets valuation allowance	$ 0		$ 0
Income tax examination estimated penalty		$ 1,900,000
Gross unrecognized tax benefits	500,000		$ 800,000
Operating loss carryforward	0
Federal General Business Tax Credit Carry Forward [Member]
Income Tax Contingency [Line Items]
Tax credit carryforwards	0
Alternative Minimum Tax Credit Carry Forward [Member]
Income Tax Contingency [Line Items]
Tax credit carryforwards	$ 0
Internal Revenue Service [Member]
Income Tax Contingency [Line Items]
Wage based tax credits claimed amount to be disallowed results estimated additional tax due		$ 8,000,000
Internal Revenue Service [Member] | Minimum [Member]
Income Tax Contingency [Line Items]
Ongoing audit for tax years	2017
Internal Revenue Service [Member] | Minimum [Member] | Wage Based Tax Credits [Member]
Income Tax Contingency [Line Items]
Ongoing audit for tax years	2017
Internal Revenue Service [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Ongoing audit for tax years	2021
Internal Revenue Service [Member] | Maximum [Member] | Wage Based Tax Credits [Member]
Income Tax Contingency [Line Items]
Ongoing audit for tax years	2021