Barrett Business Services (BBSI) 10-K 6 Mar 23 2022 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 20, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Trading Symbol	BBSI
Entity Registrant Name	BARRETT BUSINESS SERVICES, INC.
Entity Central Index Key	0000902791
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Common Stock, Shares Outstanding		6,876,398
Entity Public Float			$ 503,083,248
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
Entity File Number	0-21886
Document Annual Report	true
Document Transition Report	false
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
Auditor Name	Deloitte & Touche LLP
Auditor Location	Portland,
Auditor Firm ID	34
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the definitive Proxy Statement for the 2023 Annual Meeting of Stockholders are hereby incorporated by reference in Part III of Form 10-K.

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 91,423	$ 69,405
Investments	68,325	96,763
Trade accounts receivable, net	163,838	155,707
Prepaid expenses and other	19,787	17,606
Restricted cash and investments	110,989	67,238
Total current assets	454,362	406,719
Property, equipment and software, net	45,954	36,277
Operating lease right-of-use assets	19,804	20,697
Restricted cash and investments	104,277	232,965
Goodwill	47,820	47,820
Other assets	3,281	2,474
Deferred income taxes	11,440
Total assets	686,938	746,952
Current liabilities:
Current portion of long-term debt		3,510
Accounts payable	8,264	4,485
Accrued payroll, payroll taxes and related benefits	222,331	199,067
Income taxes payable	610	1,673
Current operating lease liabilities	6,957	7,191
Other accrued liabilities	31,603	15,120
Workers' compensation claims liabilities	62,917	80,028
Safety incentives liability	2,049	4,322
Total current liabilities	334,731	315,396
Long-term workers' compensation claims liabilities	153,070	199,379
Deferred income taxes		1,687
Long-term operating lease liabilities	14,225	14,598
Customer deposits and other long-term liabilities	7,070	7,362
Total liabilities	509,096	538,422
Commitments and contingencies (Notes 6, 8 and 12)
Stockholders' equity:
Common stock, $.01 par value; 20,500 shares authorized, 6,871 and 7,415 shares issued and outstanding in 2022 and 2021, respectively	69	74
Additional paid-in capital	32,744	29,054
Accumulated other comprehensive (loss) income	(27,594)	1,079
Retained earnings	172,623	178,323
Total stockholders' equity	177,842	208,530
Total liabilities and stockholders' equity	$ 686,938	$ 746,952

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	20,500,000	20,500,000
Common stock, shares issued	6,871,000	7,415,000
Common stock, shares outstanding	6,871,000	7,415,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Total revenues	$ 1,054,326	$ 955,166	$ 880,824
Cost of revenues:
Total cost of revenues	819,481	750,658	697,917
Gross margin	234,845	204,508	182,907
Selling, general and administrative expenses	169,642	155,259	141,916
Depreciation and amortization	6,228	5,326	4,844
Income from operations	58,975	43,923	36,147
Other income (expense):
Investment income, net	6,476	7,215	7,977
Interest expense	(141)	(372)	(1,244)
Other, net	(7)	(105)	(284)
Other income, net	6,328	6,738	6,449
Income before income taxes	65,303	50,661	42,596
Provision for income taxes	18,035	12,582	8,831
Net income	$ 47,268	$ 38,079	$ 33,765
Basic income per common share	$ 6.63	$ 5.05	$ 4.46
Weighted average number of basic common shares outstanding	7,130	7,540	7,577
Diluted income per common share	$ 6.54	$ 5	$ 4.39
Weighted average number of diluted common shares outstanding	7,226	7,621	7,688
Professional Employer Services [Member]
Revenues:
Total revenues	$ 937,363	$ 843,815	$ 777,430
Staffing Services [Member]
Revenues:
Total revenues	116,963	111,351	103,394
Direct Payroll Costs [Member]
Cost of revenues:
Total cost of revenues	87,944	83,821	78,380
Payroll Taxes and Benefits [Member]
Cost of revenues:
Total cost of revenues	522,392	469,888	418,793
Workers' Compensation [Member]
Cost of revenues:
Total cost of revenues	$ 209,145	$ 196,949	$ 200,744

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 47,268	$ 38,079	$ 33,765
Unrealized (losses) gains on investments, net of tax of ($2,478), $1,814, and $3,014 in 2021, 2020, and 2019, respectively	(28,673)	(6,485)	4,745
Comprehensive income	$ 18,595	$ 31,594	$ 38,510

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) on investments, tax	$ (10,958)	$ (2,478)	$ 1,814

Consolidated Statements of Stoc

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, 2019	$ 171,799	$ 75	$ 20,227	$ 2,819	$ 148,678
Beginning Balance, shares at Dec. 31, 2019		7,514
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards	3,084	$ 2	3,082
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares		223
Common stock repurchased on vesting of restricted stock units and performance awards	(1,417)		(1,417)
Common stock repurchased on vesting of restricted stock units and performance awards, shares		(27)
Share-based compensation expense	3,436		3,436
Company repurchase of common stock	(8,056)	$ (1)	(443)		(7,612)
Company repurchase of common stock, shares		(144)
Cash dividends on common stock	(9,121)				(9,121)
Unrealized gain (loss) on investments, net of tax	4,745			4,745
Net income	33,765				33,765
Ending Balance at Dec. 31, 2020	198,235	$ 76	24,885	7,564	165,710
Ending Balance, shares at Dec. 31, 2020		7,566
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards	1,156	$ 1	1,155
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares		106
Common stock repurchased on vesting of restricted stock units and performance awards	(1,465)		(1,465)
Common stock repurchased on vesting of restricted stock units and performance awards, shares		(20)
Share-based compensation expense	5,366		5,366
Company repurchase of common stock	(17,287)	$ (3)	(887)		(16,397)
Company repurchase of common stock, shares		(237)
Cash dividends on common stock	(9,069)				(9,069)
Unrealized gain (loss) on investments, net of tax	(6,485)			(6,485)
Net income	38,079				38,079
Ending Balance at Dec. 31, 2021	208,530	$ 74	29,054	1,079	178,323
Ending Balance, shares at Dec. 31, 2021		7,415
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards	711	$ 1	710
Common stock issued on exercise of options, purchase of ESPP shares and vesting of restricted stock units and performance awards, shares		84
Common stock repurchased on vesting of restricted stock units and performance awards	(1,692)		(1,692)
Common stock repurchased on vesting of restricted stock units and performance awards, shares		(22)
Share-based compensation expense	7,390		7,390
Company repurchase of common stock	(47,168)	$ (6)	(2,718)		(44,444)
Company repurchase of common stock, shares		(606)
Cash dividends on common stock	(8,524)				(8,524)
Unrealized gain (loss) on investments, net of tax	(28,673)			(28,673)
Net income	47,268				47,268
Ending Balance at Dec. 31, 2022	$ 177,842	$ 69	$ 32,744	$ (27,594)	$ 172,623
Ending Balance, shares at Dec. 31, 2022		6,871

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock per share	$ 1.20	$ 1.20	$ 1.20

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 47,268	$ 38,079	$ 33,765
Reconciliations of net income to net cash provided by (used in) operating activities:
Depreciation and amortization	6,228	5,326	4,844
Non-cash operating lease expense	6,955	8,045	7,246
Investment amortization and losses recognized	1,859	1,433	587
Loss recognized on disposal of property and equipment	139	114	574
Deferred income taxes	(2,169)	(347)	5,492
Share-based compensation	7,390	5,366	3,436
Changes in certain operating assets and liabilities:
Trade accounts receivable	(8,131)	(37,201)	45,055
Income taxes	(1,063)	8,158	(5,150)
Prepaid expenses and other	(2,181)	(1,645)	(1,042)
Accounts payable	3,779	(261)	(1,247)
Accrued payroll, payroll taxes and related benefits	24,916	49,739	(22,608)
Other accrued liabilities	15,725	7,753	(1,671)
Workers' compensation claims liabilities	(64,222)	(77,640)	(80,783)
Safety incentives liability	(2,273)	(14,505)	(9,123)
Operating lease liabilities	(6,740)	(7,886)	(7,062)
Other assets and liabilities, net	298	13	(228)
Net cash provided by (used in) operating activities	27,778	(15,459)	(27,915)
Cash flows from investing activities:
Purchase of property, equipment and software	(15,973)	(6,801)	(8,610)
Purchase of investments		(54,835)	(65,738)
Proceeds from sales and maturities of investments	18,732	75,256	47,922
Purchase of restricted investments	(4,345)	(253,781)	(34,968)
Proceeds from sales and maturities of restricted investments	62,740	127,298	65,535
Net cash provided by (used in) investing activities	61,154	(112,863)	4,141
Cash flows from financing activities:
Proceeds from credit-line borrowings		2,718
Payments on credit-line borrowings		(2,718)
Payments on long-term debt	(3,510)	(221)	(220)
Repurchase of common stock	(47,168)	(17,287)	(8,056)
Common stock repurchased on vesting of stock awards	(1,692)	(1,465)	(1,417)
Dividends paid	(8,524)	(9,069)	(9,121)
Proceeds from exercise of stock options	711	1,156	3,084
Net cash used in financing activities	(60,183)	(26,886)	(15,730)
Net increase (decrease) in cash, cash equivalents and restricted cash	28,749	(155,208)	(39,504)
Cash, cash equivalents and restricted cash, beginning of period	78,629	233,837	273,341
Cash, cash equivalents and restricted cash, end of period	$ 107,378	$ 78,629	$ 233,837

Summary of Operations and Signi

Summary of Operations and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Operations and Significant Accounting Policies	Note 1 - Summary of Operations and Significant Accounting Policies Nature of operations Barrett Business Services, Inc. (“BBSI” or the “Company”), is a leading provider of business management solutions for small and mid-sized companies. The Company has developed a management platform that integrates a knowledge-based approach from the management consulting industry with tools from the human resource outsourcing industry. This platform, through the effective leveraging of human capital, helps our business owner clients run their businesses more effectively. We believe this platform, delivered through our decentralized organizational structure, differentiates BBSI from our competitors. The Company supports clients with a local presence in 68 markets throughout the United States. Approximately 73 %, 73 % and 75 %, respectively, of our revenue during 2022, 2021 and 2020 was attributable to our California operations. BBSI was incorporated in Maryland in 1965. The Company operates a wholly owned, fully licensed captive insurance company, Associated Insurance Company for Excess ("AICE") and a wholly owned, fully licensed insurance company, Ecole. AICE and Ecole provide access to more competitive and cost-effective insurance markets and provide cost-effective risk management. See “Note 4 - Workers’ Compensation Claims” for additional information in the Company’s insurance programs. Principles of consolidation The accompanying financial statements are prepared on a consolidated basis. All intercompany account balances and transactions between BBSI, AICE, and Ecole have been eliminated in consolidation. Reportable segment The Company has one operating and reporting segment. The chief operating decision maker (our Chief Executive Officer) regularly reviews the financial information of our business at a consolidated level in deciding how to allocate resources and in assessing performance. 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 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. We also present revenue net of safety incentives, because these incentives represent consideration payable to customers. Cost of revenues Our cost of revenues for PEO services includes employer payroll-related taxes and workers' compensation costs. Our cost of revenues for staffing services includes direct payroll costs, employer payroll-related taxes, employee benefits, and workers’ compensation costs. Direct payroll costs represent the gross payroll earned by staffing services employees based on salary or hourly wages. Payroll taxes and employee benefits consist of the employer's portion of Social Security and Medicare taxes, federal and state unemployment taxes, and staffing services employee reimbursements for materials, supplies and other expenses, which are paid by our customer. 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, risk manager payroll, as well as costs associated with operating our two wholly owned insurance companies, AICE and 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 consolidated statements of cash flows and 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 income (loss) in stockholders' equity. Investments are recorded as current on the 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 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 income (loss) in stockholders’ equity. Restricted cash and investments are classified as current and noncurrent on the 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 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 (loss) from operations. Concentration of Credit Risk Financial instruments that potentially subject us to concentration of credit risk consist primarily of cash equivalents, investments, restricted cash and investments, and trade accounts receivable. We limit investment of cash equivalents and investments to financial institutions with high credit ratings. Credit risk on trade accounts is minimized as a result of the large and diverse nature of our customer base. Allowance for doubtful accounts The Company had an allowance for doubtful accounts of $ 893,000 and $ 460,000 at December 31, 2022 and 2021, respectively. 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 doubtful accounts. If the financial condition of our customers deteriorates resulting in an impairment of their ability to make payments, additional allowances may be required. Our allowance for doubtful accounts activity is summarized as follows (in thousands): 2022 2021 2020 Balance at January 1, Allowance for doubtful accounts $ 460 $ 757 $ 888 Charges to expense 462 193 125 Write-offs of uncollectible accounts, net ( 29 ) ( 490 ) ( 256 ) Balance at December 31, Allowance for doubtful accounts $ 893 $ 460 $ 757 Income taxes Our income taxes are accounted for using an asset and liability approach. This requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial statement and tax basis of assets and liabilities at the applicable tax rates. A valuation allowance is recorded against deferred tax assets if, based on the weight of the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. The factors used to assess the likelihood of realization include the Company’s forecast of the reversal of temporary differences, future taxable income and available tax planning strategies that could be implemented to realize the net deferred tax assets. Failure to achieve forecasted taxable income in applicable tax jurisdictions could affect the ultimate realization of deferred tax assets and could result in an increase in the Company’s effective tax rate on future earnings. The determination of our provision for income taxes requires significant judgment, the use of estimates, and the interpretation and application of complex tax laws. Significant judgment is required in assessing the timing and amounts of deductible and taxable items and the probability of sustaining uncertain tax positions. The Company recognizes the tax benefit from uncertain tax positions if it is more likely than not that the tax positions will be sustained on examination by the tax authorities. The tax benefit is measured based on the largest benefit that has a greater than 50 % likelihood of being realized upon ultimate settlement. As facts and circumstances change, we reassess these probabilities and record any changes in the consolidated financial statements as appropriate. The Company recognizes interest and penalties related to unrecognized tax benefits in income tax expense. Goodwill and intangible assets Goodwill is recorded as the difference, if any, between the aggregate consideration paid for a business combination and the fair value of the net assets acquired. Goodwill is not amortized but is evaluated for impairment annually, or more frequently if circumstances indicate that it is more likely than not that the fair value of the reporting unit is below its carrying value. The Company has one reporting unit and evaluates the carrying value of goodwill annually at December 31. No impairment has been recognized in the periods presented. Property, equipment and software Property, equipment and software are stated at cost. Expenditures for maintenance and repairs are charged to selling, general and administrative expenses as incurred and expenditures for additions and improvements to property and equipment are capitalized. The cost of assets sold or otherwise disposed of and the related accumulated depreciation are eliminated from the accounts, and any resulting gain or loss is reflected in the consolidated statements of operations. We capitalize software development costs incurred during the application development stage, which is the stage when preliminary project planning ends and software development begins. Capitalized costs generally include both internal and external costs associated with coding and testing. Capitalized costs are amortized on a straight-line basis over the estimated useful life, commencing when the software is placed into service. Costs incurred during the preliminary project stage and the postimplementation stage, as well as general and administrative and overhead costs, are expensed as they are incurred. Depreciation of property and equipment and amortization of software is calculated using the straight-line method over estimated useful lives of the related assets or lease terms, as follows: Years Buildings 39 Equipment, furniture and fixtures 7 - 15 Computer hardware, software and software development costs 3 - 10 Leasehold improvements 1 - 7 Impairment of long-lived assets Long-lived assets, such as property, equipment and software and acquired intangibles subject to amortization, are reviewed for impairment annually, or whenever events or changes in circumstances indicate that the remaining estimated useful life may warrant revision or that the carrying amount of an asset may not be recoverable. Some of the events or changes in circumstances that would trigger an impairment review include, but are not limited to, significant under-performance relative to expected and/or historical results, significant negative industry or economic trends, or knowledge of transactions involving the sale of similar property at amounts below the carrying value. Assets are grouped for measurement of impairment at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets. If the carrying amount of an asset group exceeds the estimated undiscounted future cash flows expected to be generated by the asset group, then an impairment charge is recognized to the extent the carrying amount exceeds the asset group’s fair value. In determining fair value, management considers current results, trends, future prospects, and other economic factors. Leases The Company leases office facilities and equipment under operating leases. We determine whether an arrangement is or contains a lease at inception. For all leases with a term greater than 12 months, we record our operating lease liabilities and right-of-use (ROU) assets at the lease commencement date. Operating lease liabilities are based on the present value of future minimum lease payments over the lease term, and include options to renew a lease in the future minimum lease payments if it is reasonably certain that the Company will exercise that option. ROU assets are based on the lease liability, adjusted for any lease prepayments and lease incentives. If a lease does not provide an implicit interest rate, we use our incremental borrowing rate on a collateralized basis from the information available at commencement date in determining the present value of lease payments. We recognize expense for lease payments on a straight-line basis over the lease term for operating leases. Leases with initial terms of 12 months or less are considered short-term lease costs and are not recorded as ROU assets on the consolidated balance sheets. ROU assets are reviewed for impairment in the same manner as long-lived assets. No impairment has been recorded in the periods presented. The Company has elected the practical expedient not to separate non-lease components from lease components for all classes of assets. Our lease agreements generally do not contain material variable lease payments or restrictive covenants. 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 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. Safety incentives We accrue for and present expected safety incentives as a reduction of revenue. Safety incentives represent cash incentives paid to certain PEO client companies for maintaining safe work practices and minimizing workplace injuries. The incentive is based on a percentage of annual payroll and is paid annually to customers who meet predetermined workers’ compensation claims cost objectives. Safety incentive payments are made only after closure of all workers' compensation claims incurred during the customer’s contract period. The safety incentive liability is estimated and accrued each month based upon contract year-to-date payroll and the then current amount of the customer’s estimated workers’ compensation claims reserves as established by us and our third-party administrator. In July 2020, the Company began limiting its safety incentive offering in certain markets. The Company provided $ 2.0 million and $ 4.3 million at December 31, 2022 and 2021 , respectively, as an estimate of the liability for unpaid safety incentives. 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 U.S. generally accepted accounting principles (“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 in 2022, 2021 and 2020 did not materially differ from interest expense. Income taxes paid by the Company totaled $ 21.0 mil lion, $ 4.7 million, and $ 8.5 million in 2022, 2021 and 2020, 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 consolidated balance sheets to the amounts reported on the consolidated statements of cash flows (in thousands): December 31, December 31, December 31, 2022 2021 2020 Cash and cash equivalents $ 91,423 $ 69,405 $ 68,688 Restricted cash, included in restricted cash and investments 15,955 9,224 165,149 Total cash, cash equivalents and restricted cash shown in the $ 107,378 $ 78,629 $ 233,837 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 are summarized as follows (in thousands): Year Ended December 31, 2022 2021 2020 Weighted average number of basic shares outstanding 7,130 7,540 7,577 Effect of dilutive securities 96 81 111 Weighted average number of diluted shares outstanding 7,226 7,621 7,688 Accounting estimates The preparation of our 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 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 doubtful accounts, deferred income taxes, carrying values for goodwill and property, equipment and software, accrued workers' compensation liabilities and safety incentive liabilities. Actual results may or may not differ from such estimates. Recent accounting pronouncements There were no new or pending accounting pronouncements in 2022 that had, or will have, a material impact on our results of operations or financial condition.

Fair Value Measurement

Fair Value Measurement	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurement	Note 2 - Fair Value Measurement Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. All of our financial instruments are recognized in our consolidated balance sheets. Carrying values approximate fair value of most financial assets and liabilities. Investments and restricted cash and investments are recorded at market value. The interest rates on our investments approximate current market rates for these types of investments. In determining the fair value of our financial assets, the Company predominately uses the market approach. In determining the fair value of all its corporate bonds, mortgage backed securities, U.S. treasuries, U.S. government agency securities, mutual funds, money market funds, asset backed securities, and emerging markets, the Company utilizes non-binding quotes provided by our investment brokers. Factors used in determining the fair value of our financial assets and liabilities are summarized into three levels as established in the fair value hierarchy framework. The three levels of the fair value hierarchy are described below. Level 1 – Inputs to the valuation methodology are unadjusted quoted prices for identical assets or liabilities in active markets. Level 2 – Inputs to the valuation methodology include: • Quoted prices for similar assets or liabilities in active markets; • Quoted prices for identical or similar assets or liabilities in inactive markets; • Inputs other than quoted prices that are observable for the asset or liability; • Inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3 – Inputs to the valuation methodology are unobservable and significant to the fair value measurement. In determining the fair value measurement of our financial assets, the fair value measurement level within the hierarchy is based on the lowest level input and is applied to each financial asset. Valuation techniques are used to maximize the use of observable inputs and minimize the use of unobservable inputs. The following table summarizes the Company’s investments at December 31, 2022 and 2021 measured at fair value on a recurring basis (in thousands): December 31, 2022 December 31, 2021 Gross Gross Unrealized Unrealized Gains Recorded Gains Recorded Cost (Losses) Basis Cost (Losses) Basis Current: Cash equivalents: Money market funds $ 40,296 $ — $ 40,296 $ 13,384 $ — $ 13,384 Total cash equivalents 40,296 — 40,296 13,384 — 13,384 Investments: Corporate bonds 38,489 ( 5,181 ) 33,308 41,954 ( 136 ) 41,818 Mortgage backed securities 16,135 ( 3,139 ) 12,996 18,089 ( 440 ) 17,649 Asset backed securities 13,709 ( 737 ) 12,972 29,533 ( 38 ) 29,495 U.S. government agency securities 7,369 ( 302 ) 7,067 7,383 418 7,801 Emerging markets 2,044 ( 62 ) 1,982 — — — Total current investments 77,746 ( 9,421 ) 68,325 96,959 ( 196 ) 96,763 Restricted cash and investments (1) : Corporate bonds 81,993 ( 11,296 ) 70,697 117,700 ( 17 ) 117,683 U.S. treasuries 66,479 ( 9,222 ) 57,257 67,614 ( 342 ) 67,272 Mortgage backed securities 46,138 ( 6,045 ) 40,093 64,217 764 64,981 U.S. government agency securities 26,479 ( 2,156 ) 24,323 32,898 1,281 34,179 Mutual funds 6,301 — 6,301 6,273 — 6,273 Money market funds 646 — 646 528 — 528 Asset backed securities 9 — 9 107 1 108 Total restricted cash and investments 228,045 ( 28,719 ) 199,326 289,337 1,687 291,024 Total investments $ 346,087 $ ( 38,140 ) $ 307,947 $ 399,680 $ 1,491 $ 401,171 (1) Included in restricted cash and investments within the consolidated balance sheets as of December 31, 2022 and 2021 is restricted cash of $ 15.9 million and $ 9.2 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 December 31, 2022 and 2021 measured at fair value on a recurring basis by fair value hierarchy level (in thousands): December 31, 2022 December 31, 2021 Total Total Recorded Recorded Basis Level 1 Level 2 Level 3 Other (1) Basis Level 1 Level 2 Level 3 Other (1) Cash equivalents: Money market $ 40,296 $ — $ — $ — $ 40,296 $ 13,384 $ — $ — $ — $ 13,384 Investments: Corporate bonds 33,308 — 33,308 — — 41,818 — 41,818 — — Mortgage backed 12,996 — 12,996 — — 17,649 — 17,649 — — Asset backed securities 12,972 — 12,972 — — 29,495 — 29,495 — — U.S. government 7,067 — 7,067 — — 7,801 — 7,801 — — Emerging markets 1,982 — 1,982 — — — — — — — Restricted cash and investments: Corporate bonds 70,697 — 70,697 — — 117,683 — 117,683 — — U.S. treasuries 57,257 — 57,257 — — 67,272 — 67,272 — — Mortgage backed 40,093 — 40,093 — — 64,981 — 64,981 — — U.S. government 24,323 — 24,323 — — 34,179 — 34,179 — — Mutual funds 6,301 6,301 — — — 6,273 6,273 — — — Money market 646 — — — 646 528 — — — 528 Asset backed securities 9 — 9 — — 108 — 108 — — Total investments $ 307,947 $ 6,301 $ 260,704 $ — $ 40,942 $ 401,171 $ 6,273 $ 380,986 $ — $ 13,912 (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 December 31, 2022 and 2021. 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. December 31, 2022 (In thousands) Less than 1 Year Between 1 to 5 Years Between 5 to 10 Years After 10 Years Total Corporate bonds $ 646 $ 50,439 $ 52,920 $ — $ 104,005 U.S. treasuries 440 3,405 53,412 — 57,257 Money market funds 40,539 — — — 40,539 U.S. government agency securities 3,943 24,025 3,422 — 31,390 Asset backed securities — 9 2,113 10,859 12,981 Emerging markets — 1,982 — — 1,982 Total $ 45,568 $ 79,860 $ 111,867 $ 10,859 $ 248,154 December 31, 2021 (In thousands) Less than 1 Year Between 1 to 5 Years Between 5 to 10 Years After 10 Years Total Corporate bonds $ 24,601 $ 35,570 $ 99,180 $ 150 $ 159,501 U.S. treasuries 953 4,295 62,024 — 67,272 U.S. government agency securities — 25,171 16,809 — 41,980 Asset backed securities — 108 2,200 27,295 29,603 Money market funds 13,657 — — — 13,657 Total $ 39,211 $ 65,144 $ 180,213 $ 27,445 $ 312,013 The average contractual maturity of mortgage backed securities, which are excluded from the table above, was 24 years and 23 years as of December 31, 2022 and 2021 , respectively.

Property, Equipment and Softwar

Property, Equipment and Software	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property, Equipment and Software	Note 3 - Property, Equipment and Software Property, equipment and software consists of the following (in thousands): December 31, 2022 2021 Buildings $ 16,862 $ 16,857 Equipment, furniture and fixtures 24,407 14,671 Computer hardware and software 6,408 11,458 Software development costs 28,631 23,332 76,308 66,318 Less accumulated depreciation and amortization ( 31,844 ) ( 31,531 ) 44,464 34,787 Land 1,490 1,490 $ 45,954 $ 36,277 We recognized $ 3.4 million, $ 3.1 million and $ 3.4 million in depreciation expense associated with our property and equipment in 2022, 2021 and 2020 , respectively. We recognized $ 2.8 million, $ 2.2 million, and $ 1.4 million in amortization of capitalized software development costs in 2022, 2021 and 2020 , respectively. We capitalized $ 5.3 million, $ 5.0 million and $ 6.0 million of software development costs in 2022, 2021 and 2020 , respectively.

Workers' Compensation Claims

Workers' Compensation Claims	12 Months Ended
	Dec. 31, 2022
Text Block [Abstract]
Workers' Compensation Claims	Note 4 - Workers' Compensation Claims The following table summarizes the aggregate workers' compensation reserve activity (in thousands): Years Ended December 31, 2022 2021 2020 Beginning balance Workers' compensation claims liabilities $ 279,407 $ 357,746 $ 438,986 Add: claims expense accrual Current period 19,146 75,786 147,097 Prior periods ( 11,337 ) ( 9,225 ) ( 6,383 ) 7,809 66,561 140,714 Less: claim payments related to Current period 4,450 15,063 22,877 Prior periods 67,581 129,138 198,620 72,031 144,201 221,497 Change in claims incurred in excess of retention limits 802 ( 699 ) ( 457 ) Ending balance Workers' compensation claims liabilities $ 215,987 $ 279,407 $ 357,746 Incurred but not reported (IBNR) $ 110,824 $ 153,838 $ 210,798 Ratio of IBNR to workers' compensation claims 51 % 55 % 59 % 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 83 % of the Company’s workers’ compensation exposure is covered through the insured program. The Company entered into a new arrangement for its insured program effective July 1, 2021 whereby third-party insurers assumed all risk of loss for claims incurred from July 1, 2021 to June 30, 2022 (the “2021-2022 Policy”). The 2021-2022 Policy allows for premium adjustments depending on overall policy performance. If claims develop favorably, BBSI can participate in the savings up to $ 20.0 million for the twelve-month policy period. If claims develop adversely, additional premium may be charged up to $ 7.5 million for the twelve-month policy period. Effective July 1, 2022, the Company renewed the arrangement for its insured program, which now continues through June 30, 2023 (the “2022-2023 Policy”). Under the renewed arrangement, the Company can participate in savings up to $ 22.5 million for the twelve-month policy period. For the 2022-2023 Policy, no additional premium may be charged if claims develop adversely. The 2022-2023 Policy includes a renewal commitment through June 30, 2024. 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. On June 29, 2020, the Company entered into a loss portfolio transfer agreement (“LPT 1”) to remove all outstanding workers’ compensation claims obligations for claims incurred under its insured program between February 1, 2014 and December 31, 2017. This transaction reduced the Company’s outstanding workers’ compensation liabilities and trust account balances by $ 115.7 million. On June 30, 2021, the Company entered into a loss portfolio transfer agreement (“LPT 2”) to remove all remaining outstanding workers’ compensation claims obligations for client policies issued under its insured program up to June 30, 2018. This transaction reduced the Company’s outstanding workers’ compensation liabilities by $ 53.1 million. 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 ( 1) LPT 2 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 $ 188.2 million and $ 273.6 million at December 31, 2022 and December 31, 2021, 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 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 17 % 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 $ 54.5 million and $ 58.4 million at December 31, 2022 and 2021, respectively, to cover potential workers’ compensation claims losses related to the Company’s current and former status as a self-insured employer. At December 31, 2022 , the Company provided surety bonds totaling $ 54.5 million, including a California requirement of $ 22.3 million. Claims liabilities The Company provided a total of $ 216.0 million and $ 279.4 million at December 31, 2022 and 2021 , respectively, as an estimated future liability for unsettled workers' compensation claims liabilities. Of this amount, $ 3.0 million and $ 2.2 million on December 31, 2022 and 2021 , respectively, represent case reserves incurred in excess of the Company’s retention. The accrual for costs incurred in excess of retention limits is offset by a receivable from insurance carriers of $ 3.0 million and $ 2.2 million at December 31, 2022 and 2021 , respectively, included in other assets in the consolidated balance sheets.

Revolving Credit Facility and L

Revolving Credit Facility and Long-Term Debt	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Revolving Credit Facility and Long-Term Debt	Note 5 - 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 $ 8.0 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 0.30 % 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 December 31, 2022 and 2021. The credit facility is collateralized by the Company’s accounts receivable and other rights to receive payment. 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 $ 100 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 would occur, 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 December 31, 2022, the Company was in compliance with all covenants. The Company maintained a mortgage loan with the Bank with a balance of approximately $ 3.5 million at December 31, 2021. On January 31, 2022, the Company paid the outstanding balance of the mortgage loan.

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2022
Retirement Benefits [Abstract]
Benefit Plans	Note 6 - Benefit Plans We have a 401(k) Retirement Savings Plan for the benefit of our eligible employees. Employees covered under a PEO arrangement may participate in the plan at the sole discretion of the PEO client. We make matching contributions to the 401(k) plan under a safe harbor provision. The determination of any discretionary Company contributions to the plan is at the sole discretion of our Board of Directors. No discretionary Company contributions were made to the plan for the years ended December 31, 2022, 2021 and 2020 . We made matching contributions of $ 2.1 million, $ 1.9 million and $ 1.8 million in 2022, 2021 and 2020, respectively. The Company allows certain highly compensated employees of the Company to defer compensation under a nonqualified deferred compensation plan. The long-term portion of the deferred compensation plan liability was $ 5.8 million and $ 6.3 million at December 31, 2022 and 2021 , respectively, and is recorded in customer deposits and other long-term liabilities on the consolidated balance sheets. The current portion of the deferred compensation plan liability was $ 1.0 million and $ 0.2 million at December 31, 2022 and 2021 , respectively, and is recorded in other accrued liabilities on the consolidated balance sheets. The fair value of the long-term portion of this plan was $ 6.7 million and $ 6.3 million at December 31, 2022 and 2021 , respectively, and is recorded in noncurrent restricted cash and investments on the consolidated balance sheets. The fair value of the current portion of this plan was $ 1.0 million and $ 0.2 million at December 31, 2022 and 2021 , respectively, and is recorded in current restricted cash and investments on the consolidated balance sheets.

Leases

Leases	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Leases	Note 7 - Leases The Company primarily leases office buildings under operating leases which are included in Operating lease right-of-use (“ROU”) assets, Current operating lease liabilities, and Long-term operating lease liabilities on the consolidated balance sheets. The Company’s leases have remaining terms of 1 to 7 years . Information related to the Company's total lease costs was as follows (in thousands): Year Ended December 31, 2022 December 31, 2021 Operating lease cost $ 7,747 $ 8,957 Variable lease cost 1,310 689 Short-term lease cost 165 94 Total lease cost $ 9,222 $ 9,740 Information related to the Company's ROU assets and related lease liabilities was as follows (in thousands): Year Ended December 31, 2022 December 31, 2021 Cash paid for operating lease liabilities $ 7,607 $ 8,854 Right-of-use assets obtained in exchange for new operating lease obligations 6,591 5,717 December 31, 2022 December 31, 2021 Weighted-average remaining lease term 3.8 years 3.6 years Weighted-average discount rate 4.1 % 3.6 % The table below reconciles the undiscounted future minimum lease payments (displayed by year and in the aggregate) under noncancellable operating leases with terms of more than one year to the total operating lease liabilities recognized on the consolidated balance sheets as of December 31, 2022 (in thousands): 2023 $ 7,624 2024 5,915 2025 3,747 2026 2,685 2027 1,859 Thereafter 1,027 Total undiscounted future minimum lease payments 22,857 Less: Difference between undiscounted lease payments and discounted operating lease liabilities 1,675 Total operating lease liabilities $ 21,182 Current operating lease liabilities $ 6,957 Long-term operating lease liabilities 14,225 Total operating lease liabilities $ 21,182 The Company has additional operating leases of $ 1.7 million that have not commenced as of December 31, 2022 , and as such, have not been recognized in the Company’s Consolidated Balance Sheets. These operating leases are expected to commence in 2023 with lease terms of 5 years.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Note 8 - Income Taxes The provision for income taxes is as follows (in thousands): Year Ended December 31, 2022 2021 2020 Current: Federal $ 14,683 $ 9,527 $ 2,943 State 5,529 3,408 396 20,212 12,935 3,339 Deferred: Federal ( 1,096 ) 143 4,156 State ( 1,081 ) ( 496 ) 1,336 ( 2,177 ) ( 353 ) 5,492 Total provision $ 18,035 $ 12,582 $ 8,831 Deferred income tax assets and liabilities consist of the following components (in thousands): December 31, 2022 2021 Deferred income tax assets: Tax effect of unrealized losses (gains), net $ 10,565 $ ( 393 ) Workers' compensation claims liabilities 7,459 7,870 Deferred compensation 7,347 6,109 Operating lease liability 5,813 5,870 MCC accrual 2,173 167 Other 1,254 1,388 Equity based compensation 743 678 State credit carryforward 54 329 Customer incentives 6 12 Payroll tax deferral — 749 35,414 22,779 Less: valuation allowance — 163 35,414 22,616 Deferred income tax liabilities: Tax amortization of goodwill ( 9,377 ) ( 10,120 ) Tax depreciation in excess of book depreciation ( 8,914 ) ( 7,433 ) Operating lease right-of-use ( 5,316 ) ( 5,527 ) Other ( 367 ) ( 1,223 ) ( 23,974 ) ( 24,303 ) Net deferred income taxes $ 11,440 $ ( 1,687 ) The effective tax rate differed from the U.S. statutory federal tax rate due to the following: Year Ended December 31, 2022 2021 2020 Statutory federal tax rate 21.0 % 21.0 % 21.0 % State taxes, net of federal benefit 5.4 4.5 3.2 Nondeductible expenses and other, net 1.5 0.5 0.7 Adjustment for final positions on filed returns 0.2 0.9 0.6 Federal and state tax credits ( 0.5 ) ( 2.1 ) ( 4.9 ) Other, net — — 0.1 Effective tax rate 27.6 % 24.8 % 20.7 % 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 at both December 31, 2022 and December 31, 2021. 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 is examining the Company’s federal tax returns for the years ended December 31, 2017 through 2021 . In November 2022, BBSI received notice that the IRS intends to disallow certain wage-based tax credits claimed for the years 2017 through 2020 , which could result in estimated total additional taxes of $ 5.5 million and penalties of $ 1.7 million. Tax year 2021 remains under audit, however, disallowance of similar wage-based credits would result in additional estimated tax due of $ 0.2 million. The Company disagrees with the IRS determination to disallow certain wage-based credits taken by the Company and believes that the Company has the technical merits to defend its position. Based on management’s more-likely-than-not assessment that the 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 2016. As of December 31, 2022, total gross unrecognized tax benefits, excluding interest and penalties, were $ 0.6 million, which 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. As of December 31, 2021 and 2020, the Company had no material unrecognized tax benefits. 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 December 31, 2022, the Company had no state operating loss carryforwards. At December 31, 2022 , the Company did no t have a federal general business tax credit carryforward or an alternative minimum tax credit carryforward.

Stock Incentive Plans

Stock Incentive Plans	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Stock Incentive Plans	Note 9 - Stock Incentive Plans The Company's 2020 Stock Incentive Plan (the "2020 Plan"), which provides for share-based awards to Company employees, non-employee directors and outside consultants or advisors, was approved by stockholders on May 27, 2020. The number of shares of common stock reserved for issuance under the 2020 Plan is 375,000 , of which the maximum number of shares for which incentive stock options may be granted is 375,000 . The 2020 Plan replaced the Company’s 2015 Stock Incentive Plan (the “2015 Plan”), and no new share-based awards may be granted under the 2015 Plan. The number of shares available for grant at December 31, 2022 was 77,715 . Share-based compensation expense included in selling, general and administrative expenses during the years ended December 31, 2022, 2021 and 2020 , was $ 7.4 million, $ 5.4 million and $ 3.4 million, respectively. Related income tax benefits for the years ended December 31, 2022, 2021 and 2020 , were $ 1.2 million, $ 1.3 million and $ 0.8 million, respectively. Stock Options Outstanding stock options generally vest over either four or eight years and expire ten years after the date of grant. A summary of the status of the Company’s stock options at December 31, 2022, together with changes during the periods then ended, is presented below: Weighted Weighted Average Aggregate Average Remaining Intrinsic Number Exercise Contractual Value of Options Price Term (Years) (In Thousands) Outstanding at December 31, 2021 104,875 $ 68.91 — — Options exercised ( 3,750 ) 17.55 — — Outstanding at December 31, 2022 101,125 70.81 4.56 2,272 Exercisable at December 31, 2022 41,125 $ 54.18 3.58 $ 1,608 No stock options were granted during the years ended December 31, 2022, 2021 and 2020. The intrinsic value of stock options exercised for the years ended December 31, 2022, 2021 and 2020 was $0 .2 million, $ 1.7 million, and $ 4.1 million, respectively. The fair value of stock options vested for the years ended December 31, 2022 and 2020 was $ 728,000 and $ 43,000 , respectively. No stock options vested during the year ended December 31, 2021. As of December 31, 2022 , unrecognized compensation expense related to stock options was $ 1.9 million with a weighted average remaining amortization period of 3.2 years. Restricted Stock Units Restricted stock units generally vest in four equal annual installments beginning one year following the date of grant. The following table presents restricted stock unit activity: Weighted Average Grant Date Units Fair Value Nonvested at December 31, 2021 196,064 $ 65.38 Granted 87,216 74.22 Vested ( 66,723 ) 68.01 Cancelled/Forfeited ( 5,575 ) 60.58 Nonvested at December 31, 2022 210,982 $ 68.33 The total fair value of restricted stock units vested during the years ended December 31, 2022, 2021 and 2020 was $ 4.5 million, $ 3.6 million and $ 3.8 million, respectively. As of December 31, 2022 , unrecognized compensation expense related to restricted stock units was $ 11.0 million with a weighted average remaining amortization period of 2.7 years. Performance Share Units Performance share units (“PSUs”) are granted to key employees of the Company and are conditioned on attaining specified financial performance metrics. Awards are subject to upward or downward adjustments depending on whether the actual financial metrics are above or below the target level, with a maximum payout up to 200 % of a target number of shares. PSUs fully vest on the date that the Compensation Committee determines the level of attainment of specified performance goals, generally over a three-year period. The following table presents PSU activity: Weighted Average Grant Date Units Fair Value Nonvested at December 31, 2021 34,333 $ 69.54 Granted 24,147 60.15 Vested ( 3,592 ) 72.02 Cancelled/Forfeited ( 920 ) 72.02 Nonvested at December 31, 2022 53,968 $ 65.13 The total fair value of PSUs vested during the years ended December 31, 2022, 2021 and 2020 was $ 259,000 , $ 276,000 , and $ 743,000 , respectively. Employee Stock Purchase Plan The Company offers employees the right to purchase shares at a discount from the market price under the Company’s 2019 Employee Stock Purchase Plan. Subject to the annual statutory limit, employees are eligible to participate through payroll deductions of up to 15 % of their compensation. At the end of each six-month offering period, shares are purchased by the participants at 85 % of the fair market value at the end of the offering period. As of December 31, 2022 , approximately 273,000 shares were reserved for future issuance under the 2019 Employee Stock Purchase Plan.

Stock Repurchase Program

Stock Repurchase Program	12 Months Ended
	Dec. 31, 2022
Text Block [Abstract]
Stock Repurchase Program	Note 10 - Stock Repurchase Program The Company maintains a stock repurchase program approved by the Board of Directors, which authorizes the repurchase of shares from time to time in open market purchases. On February 28, 2022, the Board of Directors authorized the repurchase of up to $ 75.0 million of the Company’s common stock over a two-year period beginning February 28, 2022 . The new repurchase program replaces the program approved in August 2019 . The Company repurchased 605,937 , 237,587 and 144,470 shares at an aggregate purchase price of $ 47.2 million, $ 17.3 million, and $ 8.1 million during 2022, 2021 and 2020, respectively. In addition, shares of restricted stock units withheld to satisfy tax-withholding obligations from the vesting of restricted stock units were 23,113 , 20,308 and 25,922 in 2022, 2021 and 2020 , respectively, which are not subject to the current repurchase program. See “Note 5. Revolving Credit Facility and Long-Term Debt” for related restrictions.

Litigation

Litigation	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Litigation	Note 11 - Litigation On November 21, 2012, David Kaanaana (“Kaanaana”), a former staffing employee, filed a class action wage and hour lawsuit against BBSI in the California Superior Court on behalf of himself and certain other employees who worked at County Sanitation District No. 2 of Los Angeles County (“the District”). The trial court ruled in plaintiffs’ favor regarding certain alleged meal break violations but ruled in favor of BBSI with respect to the application of the California prevailing wage law to the District and other claims. These latter rulings were appealed by the plaintiffs to the California Court of Appeal. On November 30, 2018, the California Court of Appeal for the Second Appellate District returned its decision in Kaanaana v. Barrett Business Services, Inc., overruling the trial court's decision to dismiss the prevailing wage claim, ruling that the work in question at the District constituted “public works” under the applicable law, and also ruling that plaintiffs’ were entitled to additional remedies with regard to the meal break violations under California law. On January 9, 2019, BBSI filed a petition of review to the California Supreme Court. On February 27, 2019, the California Supreme Court granted the petition to review the Court of Appeal’s decision with respect to the prevailing wage issue. A decision from the California Supreme Court was issued March 29, 2021 affirming the Court of Appeal decision and concluding that the recycling sorting work performed by the staffing employees in question was a “public work” and therefore would be subject to prevailing wage requirements. No damages were awarded in the appeals process. The case was remanded to Superior Court for any such determination with respect to both the prevailing wage issue and any additional remedies for the meal break violations. On December 7, 2021 the parties engaged in a mediation effort which resulted in a settlement agreement on December 22, 2021. The settlement is subject to customary court approval. On January 17, 2018 and January 18, 2018, respectively, suits were filed in the California Superior Court for the County of Santa Cruz by Sandra Gill, Robert Seth Gill Jr. and Alyssa Gill, individually and on behalf of the estate of Robert S. Gill, Sr., and by Stephen and Torrey Whitmire, against Hildebrand and Sons Trucking, Daniel Harrington, BBSI, the State of California, Department of Transportation, the State of California, California Highway Patrol, and Statewide Traffic Safety and Signs seeking monetary damages arising out of personal injuries and a fatality suffered after Messrs. Gill and Whitmire were struck by a truck at a California highway mudslide removal operation. Hildebrand was a PEO client of BBSI and operated the truck involved in the accident. The actions allege that the injuries and death were the result of, among other things, the negligent actions of a Hildebrand employee, and the unsafe conditions at the mudslide removal operation. In February 2023, BBSI and the plaintiffs reached an agreement to settle, which will remove BBSI from the suit. In addition to the matters above, 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 the matters discussed above, as well as other cases, management has recorded estimated liabilities totaling $ 3.5 million in other accrued liabilities in the condensed consolidated balance sheets.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	Note 12 - 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.

Summary of Operations and Sig_2

Summary of Operations and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of operations	Nature of operations Barrett Business Services, Inc. (“BBSI” or the “Company”), is a leading provider of business management solutions for small and mid-sized companies. The Company has developed a management platform that integrates a knowledge-based approach from the management consulting industry with tools from the human resource outsourcing industry. This platform, through the effective leveraging of human capital, helps our business owner clients run their businesses more effectively. We believe this platform, delivered through our decentralized organizational structure, differentiates BBSI from our competitors. The Company supports clients with a local presence in 68 markets throughout the United States. Approximately 73 %, 73 % and 75 %, respectively, of our revenue during 2022, 2021 and 2020 was attributable to our California operations. BBSI was incorporated in Maryland in 1965. The Company operates a wholly owned, fully licensed captive insurance company, Associated Insurance Company for Excess ("AICE") and a wholly owned, fully licensed insurance company, Ecole. AICE and Ecole provide access to more competitive and cost-effective insurance markets and provide cost-effective risk management. See “Note 4 - Workers’ Compensation Claims” for additional information in the Company’s insurance programs.
Principles of consolidation	Principles of consolidation The accompanying financial statements are prepared on a consolidated basis. All intercompany account balances and transactions between BBSI, AICE, and Ecole have been eliminated in consolidation.
Reportable Segment	Reportable segment The Company has one operating and reporting segment. The chief operating decision maker (our Chief Executive Officer) regularly reviews the financial information of our business at a consolidated level in deciding how to allocate resources and in assessing performance.
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 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. We also present revenue net of safety incentives, because these incentives represent consideration payable to customers.
Cost of revenues	Cost of revenues Our cost of revenues for PEO services includes employer payroll-related taxes and workers' compensation costs. Our cost of revenues for staffing services includes direct payroll costs, employer payroll-related taxes, employee benefits, and workers’ compensation costs. Direct payroll costs represent the gross payroll earned by staffing services employees based on salary or hourly wages. Payroll taxes and employee benefits consist of the employer's portion of Social Security and Medicare taxes, federal and state unemployment taxes, and staffing services employee reimbursements for materials, supplies and other expenses, which are paid by our customer. 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, risk manager payroll, as well as costs associated with operating our two wholly owned insurance companies, AICE and 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 consolidated statements of cash flows and 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 income (loss) in stockholders' equity. Investments are recorded as current on the 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 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 income (loss) in stockholders’ equity. Restricted cash and investments are classified as current and noncurrent on the 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 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 (loss) from operations.
Allowance for doubtful accounts	Allowance for doubtful accounts The Company had an allowance for doubtful accounts of $ 893,000 and $ 460,000 at December 31, 2022 and 2021, respectively. 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 doubtful accounts. If the financial condition of our customers deteriorates resulting in an impairment of their ability to make payments, additional allowances may be required. Our allowance for doubtful accounts activity is summarized as follows (in thousands): 2022 2021 2020 Balance at January 1, Allowance for doubtful accounts $ 460 $ 757 $ 888 Charges to expense 462 193 125 Write-offs of uncollectible accounts, net ( 29 ) ( 490 ) ( 256 ) Balance at December 31, Allowance for doubtful accounts $ 893 $ 460 $ 757
Income taxes	Income taxes Our income taxes are accounted for using an asset and liability approach. This requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial statement and tax basis of assets and liabilities at the applicable tax rates. A valuation allowance is recorded against deferred tax assets if, based on the weight of the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized. The factors used to assess the likelihood of realization include the Company’s forecast of the reversal of temporary differences, future taxable income and available tax planning strategies that could be implemented to realize the net deferred tax assets. Failure to achieve forecasted taxable income in applicable tax jurisdictions could affect the ultimate realization of deferred tax assets and could result in an increase in the Company’s effective tax rate on future earnings. The determination of our provision for income taxes requires significant judgment, the use of estimates, and the interpretation and application of complex tax laws. Significant judgment is required in assessing the timing and amounts of deductible and taxable items and the probability of sustaining uncertain tax positions. The Company recognizes the tax benefit from uncertain tax positions if it is more likely than not that the tax positions will be sustained on examination by the tax authorities. The tax benefit is measured based on the largest benefit that has a greater than 50 % likelihood of being realized upon ultimate settlement. As facts and circumstances change, we reassess these probabilities and record any changes in the consolidated financial statements as appropriate. The Company recognizes interest and penalties related to unrecognized tax benefits in income tax expense.
Goodwill and intangible assets	Goodwill and intangible assets Goodwill is recorded as the difference, if any, between the aggregate consideration paid for a business combination and the fair value of the net assets acquired. Goodwill is not amortized but is evaluated for impairment annually, or more frequently if circumstances indicate that it is more likely than not that the fair value of the reporting unit is below its carrying value. The Company has one reporting unit and evaluates the carrying value of goodwill annually at December 31. No impairment has been recognized in the periods presented.
Property, equipment and software	Property, equipment and software Property, equipment and software are stated at cost. Expenditures for maintenance and repairs are charged to selling, general and administrative expenses as incurred and expenditures for additions and improvements to property and equipment are capitalized. The cost of assets sold or otherwise disposed of and the related accumulated depreciation are eliminated from the accounts, and any resulting gain or loss is reflected in the consolidated statements of operations. We capitalize software development costs incurred during the application development stage, which is the stage when preliminary project planning ends and software development begins. Capitalized costs generally include both internal and external costs associated with coding and testing. Capitalized costs are amortized on a straight-line basis over the estimated useful life, commencing when the software is placed into service. Costs incurred during the preliminary project stage and the postimplementation stage, as well as general and administrative and overhead costs, are expensed as they are incurred. Depreciation of property and equipment and amortization of software is calculated using the straight-line method over estimated useful lives of the related assets or lease terms, as follows: Years Buildings 39 Equipment, furniture and fixtures 7 - 15 Computer hardware, software and software development costs 3 - 10 Leasehold improvements 1 - 7
Impairment of long-lived assets	Impairment of long-lived assets Long-lived assets, such as property, equipment and software and acquired intangibles subject to amortization, are reviewed for impairment annually, or whenever events or changes in circumstances indicate that the remaining estimated useful life may warrant revision or that the carrying amount of an asset may not be recoverable. Some of the events or changes in circumstances that would trigger an impairment review include, but are not limited to, significant under-performance relative to expected and/or historical results, significant negative industry or economic trends, or knowledge of transactions involving the sale of similar property at amounts below the carrying value. Assets are grouped for measurement of impairment at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets. If the carrying amount of an asset group exceeds the estimated undiscounted future cash flows expected to be generated by the asset group, then an impairment charge is recognized to the extent the carrying amount exceeds the asset group’s fair value. In determining fair value, management considers current results, trends, future prospects, and other economic factors.
Leases	Leases The Company leases office facilities and equipment under operating leases. We determine whether an arrangement is or contains a lease at inception. For all leases with a term greater than 12 months, we record our operating lease liabilities and right-of-use (ROU) assets at the lease commencement date. Operating lease liabilities are based on the present value of future minimum lease payments over the lease term, and include options to renew a lease in the future minimum lease payments if it is reasonably certain that the Company will exercise that option. ROU assets are based on the lease liability, adjusted for any lease prepayments and lease incentives. If a lease does not provide an implicit interest rate, we use our incremental borrowing rate on a collateralized basis from the information available at commencement date in determining the present value of lease payments. We recognize expense for lease payments on a straight-line basis over the lease term for operating leases. Leases with initial terms of 12 months or less are considered short-term lease costs and are not recorded as ROU assets on the consolidated balance sheets. ROU assets are reviewed for impairment in the same manner as long-lived assets. No impairment has been recorded in the periods presented. The Company has elected the practical expedient not to separate non-lease components from lease components for all classes of assets. Our lease agreements generally do not contain material variable lease payments or restrictive covenants.
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 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.
Safety incentives	Safety incentives We accrue for and present expected safety incentives as a reduction of revenue. Safety incentives represent cash incentives paid to certain PEO client companies for maintaining safe work practices and minimizing workplace injuries. The incentive is based on a percentage of annual payroll and is paid annually to customers who meet predetermined workers’ compensation claims cost objectives. Safety incentive payments are made only after closure of all workers' compensation claims incurred during the customer’s contract period. The safety incentive liability is estimated and accrued each month based upon contract year-to-date payroll and the then current amount of the customer’s estimated workers’ compensation claims reserves as established by us and our third-party administrator. In July 2020, the Company began limiting its safety incentive offering in certain markets. The Company provided $ 2.0 million and $ 4.3 million at December 31, 2022 and 2021 , respectively, as an estimate of the liability for unpaid safety incentives.
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 U.S. generally accepted accounting principles (“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 in 2022, 2021 and 2020 did not materially differ from interest expense. Income taxes paid by the Company totaled $ 21.0 mil lion, $ 4.7 million, and $ 8.5 million in 2022, 2021 and 2020, 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 consolidated balance sheets to the amounts reported on the consolidated statements of cash flows (in thousands): December 31, December 31, December 31, 2022 2021 2020 Cash and cash equivalents $ 91,423 $ 69,405 $ 68,688 Restricted cash, included in restricted cash and investments 15,955 9,224 165,149 Total cash, cash equivalents and restricted cash shown in the $ 107,378 $ 78,629 $ 233,837
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 are summarized as follows (in thousands): Year Ended December 31, 2022 2021 2020 Weighted average number of basic shares outstanding 7,130 7,540 7,577 Effect of dilutive securities 96 81 111 Weighted average number of diluted shares outstanding 7,226 7,621 7,688
Accounting estimates	Accounting estimates The preparation of our 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 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 doubtful accounts, deferred income taxes, carrying values for goodwill and property, equipment and software, accrued workers' compensation liabilities and safety incentive liabilities. Actual results may or may not differ from such estimates.
Recent accounting pronouncements	Recent accounting pronouncements There were no new or pending accounting pronouncements in 2022 that had, or will have, a material impact on our results of operations or financial condition.

Summary of Operations and Sig_3

Summary of Operations and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Allowance for Doubtful Accounts	Our allowance for doubtful accounts activity is summarized as follows (in thousands): 2022 2021 2020 Balance at January 1, Allowance for doubtful accounts $ 460 $ 757 $ 888 Charges to expense 462 193 125 Write-offs of uncollectible accounts, net ( 29 ) ( 490 ) ( 256 ) Balance at December 31, Allowance for doubtful accounts $ 893 $ 460 $ 757
Summary of Property, Equipment and Software Over Estimated Useful Life	Depreciation of property and equipment and amortization of software is calculated using the straight-line method over estimated useful lives of the related assets or lease terms, as follows: Years Buildings 39 Equipment, furniture and fixtures 7 - 15 Computer hardware, software and software development costs 3 - 10 Leasehold improvements 1 - 7
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 consolidated balance sheets to the amounts reported on the consolidated statements of cash flows (in thousands): December 31, December 31, December 31, 2022 2021 2020 Cash and cash equivalents $ 91,423 $ 69,405 $ 68,688 Restricted cash, included in restricted cash and investments 15,955 9,224 165,149 Total cash, cash equivalents and restricted cash shown in the $ 107,378 $ 78,629 $ 233,837
Summary of Basic and Diluted Common Shares Outstanding	Basic and diluted shares outstanding are summarized as follows (in thousands): Year Ended December 31, 2022 2021 2020 Weighted average number of basic shares outstanding 7,130 7,540 7,577 Effect of dilutive securities 96 81 111 Weighted average number of diluted shares outstanding 7,226 7,621 7,688

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Summary of Investments Measured at Fair Value on Recurring Basis	The following table summarizes the Company’s investments at December 31, 2022 and 2021 measured at fair value on a recurring basis (in thousands): December 31, 2022 December 31, 2021 Gross Gross Unrealized Unrealized Gains Recorded Gains Recorded Cost (Losses) Basis Cost (Losses) Basis Current: Cash equivalents: Money market funds $ 40,296 $ — $ 40,296 $ 13,384 $ — $ 13,384 Total cash equivalents 40,296 — 40,296 13,384 — 13,384 Investments: Corporate bonds 38,489 ( 5,181 ) 33,308 41,954 ( 136 ) 41,818 Mortgage backed securities 16,135 ( 3,139 ) 12,996 18,089 ( 440 ) 17,649 Asset backed securities 13,709 ( 737 ) 12,972 29,533 ( 38 ) 29,495 U.S. government agency securities 7,369 ( 302 ) 7,067 7,383 418 7,801 Emerging markets 2,044 ( 62 ) 1,982 — — — Total current investments 77,746 ( 9,421 ) 68,325 96,959 ( 196 ) 96,763 Restricted cash and investments (1) : Corporate bonds 81,993 ( 11,296 ) 70,697 117,700 ( 17 ) 117,683 U.S. treasuries 66,479 ( 9,222 ) 57,257 67,614 ( 342 ) 67,272 Mortgage backed securities 46,138 ( 6,045 ) 40,093 64,217 764 64,981 U.S. government agency securities 26,479 ( 2,156 ) 24,323 32,898 1,281 34,179 Mutual funds 6,301 — 6,301 6,273 — 6,273 Money market funds 646 — 646 528 — 528 Asset backed securities 9 — 9 107 1 108 Total restricted cash and investments 228,045 ( 28,719 ) 199,326 289,337 1,687 291,024 Total investments $ 346,087 $ ( 38,140 ) $ 307,947 $ 399,680 $ 1,491 $ 401,171 (1) Included in restricted cash and investments within the consolidated balance sheets as of December 31, 2022 and 2021 is restricted cash of $ 15.9 million and $ 9.2 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 December 31, 2022 and 2021 measured at fair value on a recurring basis by fair value hierarchy level (in thousands): December 31, 2022 December 31, 2021 Total Total Recorded Recorded Basis Level 1 Level 2 Level 3 Other (1) Basis Level 1 Level 2 Level 3 Other (1) Cash equivalents: Money market $ 40,296 $ — $ — $ — $ 40,296 $ 13,384 $ — $ — $ — $ 13,384 Investments: Corporate bonds 33,308 — 33,308 — — 41,818 — 41,818 — — Mortgage backed 12,996 — 12,996 — — 17,649 — 17,649 — — Asset backed securities 12,972 — 12,972 — — 29,495 — 29,495 — — U.S. government 7,067 — 7,067 — — 7,801 — 7,801 — — Emerging markets 1,982 — 1,982 — — — — — — — Restricted cash and investments: Corporate bonds 70,697 — 70,697 — — 117,683 — 117,683 — — U.S. treasuries 57,257 — 57,257 — — 67,272 — 67,272 — — Mortgage backed 40,093 — 40,093 — — 64,981 — 64,981 — — U.S. government 24,323 — 24,323 — — 34,179 — 34,179 — — Mutual funds 6,301 6,301 — — — 6,273 6,273 — — — Money market 646 — — — 646 528 — — — 528 Asset backed securities 9 — 9 — — 108 — 108 — — Total investments $ 307,947 $ 6,301 $ 260,704 $ — $ 40,942 $ 401,171 $ 6,273 $ 380,986 $ — $ 13,912 (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 December 31, 2022 and 2021. 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. December 31, 2022 (In thousands) Less than 1 Year Between 1 to 5 Years Between 5 to 10 Years After 10 Years Total Corporate bonds $ 646 $ 50,439 $ 52,920 $ — $ 104,005 U.S. treasuries 440 3,405 53,412 — 57,257 Money market funds 40,539 — — — 40,539 U.S. government agency securities 3,943 24,025 3,422 — 31,390 Asset backed securities — 9 2,113 10,859 12,981 Emerging markets — 1,982 — — 1,982 Total $ 45,568 $ 79,860 $ 111,867 $ 10,859 $ 248,154 December 31, 2021 (In thousands) Less than 1 Year Between 1 to 5 Years Between 5 to 10 Years After 10 Years Total Corporate bonds $ 24,601 $ 35,570 $ 99,180 $ 150 $ 159,501 U.S. treasuries 953 4,295 62,024 — 67,272 U.S. government agency securities — 25,171 16,809 — 41,980 Asset backed securities — 108 2,200 27,295 29,603 Money market funds 13,657 — — — 13,657 Total $ 39,211 $ 65,144 $ 180,213 $ 27,445 $ 312,013

Property, Equipment and Softw_2

Property, Equipment and Software (Tables)	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Summary of Property, Equipment and Software	Property, equipment and software consists of the following (in thousands): December 31, 2022 2021 Buildings $ 16,862 $ 16,857 Equipment, furniture and fixtures 24,407 14,671 Computer hardware and software 6,408 11,458 Software development costs 28,631 23,332 76,308 66,318 Less accumulated depreciation and amortization ( 31,844 ) ( 31,531 ) 44,464 34,787 Land 1,490 1,490 $ 45,954 $ 36,277

Workers' Compensation Claims (T

Workers' Compensation Claims (Tables)	12 Months Ended
	Dec. 31, 2022
Text Block [Abstract]
Summarizes Aggregate Workers' Compensation Reserve Activity	The following table summarizes the aggregate workers' compensation reserve activity (in thousands): Years Ended December 31, 2022 2021 2020 Beginning balance Workers' compensation claims liabilities $ 279,407 $ 357,746 $ 438,986 Add: claims expense accrual Current period 19,146 75,786 147,097 Prior periods ( 11,337 ) ( 9,225 ) ( 6,383 ) 7,809 66,561 140,714 Less: claim payments related to Current period 4,450 15,063 22,877 Prior periods 67,581 129,138 198,620 72,031 144,201 221,497 Change in claims incurred in excess of retention limits 802 ( 699 ) ( 457 ) Ending balance Workers' compensation claims liabilities $ 215,987 $ 279,407 $ 357,746 Incurred but not reported (IBNR) $ 110,824 $ 153,838 $ 210,798 Ratio of IBNR to workers' compensation claims 51 % 55 % 59 %
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 ( 1) LPT 2 excluded approximately 10 % of claims from 2018 and included an approximately offsetting amount of claims from 2019.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Summary of Lease Costs	Information related to the Company's total lease costs was as follows (in thousands): Year Ended December 31, 2022 December 31, 2021 Operating lease cost $ 7,747 $ 8,957 Variable lease cost 1,310 689 Short-term lease cost 165 94 Total lease cost $ 9,222 $ 9,740
Summary of Information Related to ROU Assets and Related Lease Liabilities	Information related to the Company's ROU assets and related lease liabilities was as follows (in thousands): Year Ended December 31, 2022 December 31, 2021 Cash paid for operating lease liabilities $ 7,607 $ 8,854 Right-of-use assets obtained in exchange for new operating lease obligations 6,591 5,717 December 31, 2022 December 31, 2021 Weighted-average remaining lease term 3.8 years 3.6 years Weighted-average discount rate 4.1 % 3.6 %
Reconciliation of Undiscounted Future Minimum Lease Payments Under Noncancellable Operating Leases	The table below reconciles the undiscounted future minimum lease payments (displayed by year and in the aggregate) under noncancellable operating leases with terms of more than one year to the total operating lease liabilities recognized on the consolidated balance sheets as of December 31, 2022 (in thousands): 2023 $ 7,624 2024 5,915 2025 3,747 2026 2,685 2027 1,859 Thereafter 1,027 Total undiscounted future minimum lease payments 22,857 Less: Difference between undiscounted lease payments and discounted operating lease liabilities 1,675 Total operating lease liabilities $ 21,182 Current operating lease liabilities $ 6,957 Long-term operating lease liabilities 14,225 Total operating lease liabilities $ 21,182

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Summary of Provision for Income Taxes	The provision for income taxes is as follows (in thousands): Year Ended December 31, 2022 2021 2020 Current: Federal $ 14,683 $ 9,527 $ 2,943 State 5,529 3,408 396 20,212 12,935 3,339 Deferred: Federal ( 1,096 ) 143 4,156 State ( 1,081 ) ( 496 ) 1,336 ( 2,177 ) ( 353 ) 5,492 Total provision $ 18,035 $ 12,582 $ 8,831
Summary of Deferred Income Tax Assets and Liabilities	Deferred income tax assets and liabilities consist of the following components (in thousands): December 31, 2022 2021 Deferred income tax assets: Tax effect of unrealized losses (gains), net $ 10,565 $ ( 393 ) Workers' compensation claims liabilities 7,459 7,870 Deferred compensation 7,347 6,109 Operating lease liability 5,813 5,870 MCC accrual 2,173 167 Other 1,254 1,388 Equity based compensation 743 678 State credit carryforward 54 329 Customer incentives 6 12 Payroll tax deferral — 749 35,414 22,779 Less: valuation allowance — 163 35,414 22,616 Deferred income tax liabilities: Tax amortization of goodwill ( 9,377 ) ( 10,120 ) Tax depreciation in excess of book depreciation ( 8,914 ) ( 7,433 ) Operating lease right-of-use ( 5,316 ) ( 5,527 ) Other ( 367 ) ( 1,223 ) ( 23,974 ) ( 24,303 ) Net deferred income taxes $ 11,440 $ ( 1,687 )
Summary of Effective Tax Rate Differed from U.S. Statutory Federal Tax Rate	The effective tax rate differed from the U.S. statutory federal tax rate due to the following: Year Ended December 31, 2022 2021 2020 Statutory federal tax rate 21.0 % 21.0 % 21.0 % State taxes, net of federal benefit 5.4 4.5 3.2 Nondeductible expenses and other, net 1.5 0.5 0.7 Adjustment for final positions on filed returns 0.2 0.9 0.6 Federal and state tax credits ( 0.5 ) ( 2.1 ) ( 4.9 ) Other, net — — 0.1 Effective tax rate 27.6 % 24.8 % 20.7 %

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Summary of Stock Options Activity	A summary of the status of the Company’s stock options at December 31, 2022, together with changes during the periods then ended, is presented below: Weighted Weighted Average Aggregate Average Remaining Intrinsic Number Exercise Contractual Value of Options Price Term (Years) (In Thousands) Outstanding at December 31, 2021 104,875 $ 68.91 — — Options exercised ( 3,750 ) 17.55 — — Outstanding at December 31, 2022 101,125 70.81 4.56 2,272 Exercisable at December 31, 2022 41,125 $ 54.18 3.58 $ 1,608
Schedule of Restricted Stock Unit Activity	The following table presents restricted stock unit activity: Weighted Average Grant Date Units Fair Value Nonvested at December 31, 2021 196,064 $ 65.38 Granted 87,216 74.22 Vested ( 66,723 ) 68.01 Cancelled/Forfeited ( 5,575 ) 60.58 Nonvested at December 31, 2022 210,982 $ 68.33
Schedule of Performance Share Unit Activity	The following table presents PSU activity: Weighted Average Grant Date Units Fair Value Nonvested at December 31, 2021 34,333 $ 69.54 Granted 24,147 60.15 Vested ( 3,592 ) 72.02 Cancelled/Forfeited ( 920 ) 72.02 Nonvested at December 31, 2022 53,968 $ 65.13

Summary of Operations and Sig_4

Summary of Operations and Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2022 USD ($) Company Segment Market	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2019 USD ($)
Basis Of Presentation Of Interim Period Statements [Line Items]
Number of markets | Market	68
Number of operating segment | Segment	1
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 doubtful accounts	$ 893,000	$ 460,000	$ 757,000	$ 460,000	$ 888,000
Number of reporting units | Segment	1
Goodwill and intangible assets impairment	$ 0
Impairment of long lived asset	0
Estimate of liability for unpaid safety incentives	2,000,000	4,300,000
Income taxes paid	$ 21,000,000	$ 4,700,000	$ 8,500,000
Minimum [Member]
Basis Of Presentation Of Interim Period Statements [Line Items]
Likelihood of tax benefit being realized upon settlement	50%
California [Member] | Revenue [Member] | Geographic Concentration Risk [Member]
Basis Of Presentation Of Interim Period Statements [Line Items]
Percentage of revenue attributable to geographic area	73%	73%	75%

Summary of Operations and Sig_5

Summary of Operations and Significant Accounting Policies - Summary of Allowance for Doubtful Accounts (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Allowance for doubtful accounts, beginning balance	$ 460,000	$ 757,000	$ 888,000
Charges to expense	462,000	193,000	125,000
Write-offs of uncollectible accounts, net of recoveries	(29,000)	(490,000)	(256,000)
Allowance for doubtful accounts, ending balance	$ 893,000	$ 460,000	$ 757,000

Summary of Operations and Sig_6

Summary of Operations and Significant Accounting Policies - Summary of Property, Equipment and Software Over Estimated Useful Life (Detail)	12 Months Ended
	Dec. 31, 2022
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	39 years
Minimum [Member] | Equipment, Office Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Minimum [Member] | Computer Hardware, Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	1 year
Maximum [Member] | Equipment, Office Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Maximum [Member] | Computer Hardware, Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Maximum [Member] | Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years

Summary of Operations and Sig_7

Summary of Operations and Significant Accounting Policies - Schedule of Reconciles of Cash, Cash Equivalents and Restricted Cash Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 91,423	$ 69,405	$ 68,688
Restricted cash, included in restricted cash and investments	15,955	9,224	165,149
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 107,378	$ 78,629	$ 233,837

Summary of Operations and Sig_8

Summary of Operations and Significant Accounting Policies - Summary of Basic and Diluted Common Shares Outstanding (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average number of basic shares outstanding	7,130	7,540	7,577
Effect of dilutive securities	96	81	111
Weighted average number of diluted shares outstanding	7,226	7,621	7,688

Fair Value Measurement - Summar

Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	$ 346,087	$ 399,680
Gross Unrealized Gains (Losses)	(38,140)	1,491
Recorded Basis	307,947	401,171
Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	77,746	96,959
Gross Unrealized Gains (Losses)	(9,421)	(196)
Recorded Basis	68,325	96,763
Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	228,045	289,337
Gross Unrealized Gains (Losses)	(28,719)	1,687
Recorded Basis	199,326	291,024
Money Market Funds [Member] | Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	40,296	13,384
Recorded Basis	40,296	13,384
Money Market Funds [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	646	528
Recorded Basis	646	528
Corporate Bonds [Member] | Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	38,489	41,954
Gross Unrealized Gains (Losses)	(5,181)	(136)
Recorded Basis	33,308	41,818
Corporate Bonds [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	81,993	117,700
Gross Unrealized Gains (Losses)	(11,296)	(17)
Recorded Basis	70,697	117,683
U.S. Treasuries [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	66,479	67,614
Gross Unrealized Gains (Losses)	(9,222)	(342)
Recorded Basis	57,257	67,272
Asset Backed Securities [Member] | Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	13,709	29,533
Gross Unrealized Gains (Losses)	(737)	(38)
Recorded Basis	12,972	29,495
Asset Backed Securities [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	9	107
Gross Unrealized Gains (Losses)		1
Recorded Basis	9	108
U.S. Government Agency Securities [Member] | Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	7,369	7,383
Gross Unrealized Gains (Losses)	(302)	418
Recorded Basis	7,067	7,801
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	26,479	32,898
Gross Unrealized Gains (Losses)	(2,156)	1,281
Recorded Basis	24,323	34,179
Mortgage Backed Securities [Member] | Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	16,135	18,089
Gross Unrealized Gains (Losses)	(3,139)	(440)
Recorded Basis	12,996	17,649
Mortgage Backed Securities [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	46,138	64,217
Gross Unrealized Gains (Losses)	(6,045)	764
Recorded Basis	40,093	64,981
Emerging Markets [Member] | Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	2,044
Gross Unrealized Gains (Losses)	(62)
Recorded Basis	1,982
Mutual Funds [Member] | Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	6,301	6,273
Recorded Basis	6,301	6,273
Marketable Securities Current [Member] | Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	40,296	13,384
Recorded Basis	$ 40,296	$ 13,384

Fair Value Measurement - Summ_2

Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Restricted cash	$ 15.9	$ 9.2

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	Dec. 31, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	$ 307,947	$ 401,171
Other [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	40,942	13,912
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	6,301	6,273
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	260,704	380,986
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	40,296	13,384
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	40,296	13,384
Investments [Member] | Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	33,308	41,818
Investments [Member] | Corporate Bonds [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	33,308	41,818
Investments [Member] | Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	12,996	17,649
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	12,996	17,649
Investments [Member] | Emerging Markets [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	1,982
Investments [Member] | Emerging Markets [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	1,982
Investments [Member] | U.S. Government Agency Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	7,067	7,801
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	7,067	7,801
Investments [Member] | Asset Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	12,972	29,495
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	12,972	29,495
Restricted Cash and Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	57,257	67,272
Restricted Cash and Investments [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	57,257	67,272
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	646	528
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	646	528
Restricted Cash and Investments [Member] | Corporate Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	70,697	117,683
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	70,697	117,683
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	40,093	64,981
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	40,093	64,981
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	24,323	34,179
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	24,323	34,179
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	9	108
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	9	108
Restricted Cash and Investments [Member] | Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Recorded Basis	6,301	6,273
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	$ 6,301	$ 6,273

Fair Value Measurement - Summ_4

Fair Value Measurement - Summary of Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	$ 45,568	$ 39,211
Available for sale securities, contractual maturities between 1 to 5 years	79,860	65,144
Available for sale securities, contractual maturities between 5 to 10 years	111,867	180,213
Available for sale securities, contractual maturities after 10 years	10,859	27,445
Available for sale securities, contractual maturities, Total	248,154	312,013
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	646	24,601
Available for sale securities, contractual maturities between 1 to 5 years	50,439	35,570
Available for sale securities, contractual maturities between 5 to 10 years	52,920	99,180
Available for sale securities, contractual maturities after 10 years		150
Available for sale securities, contractual maturities, Total	104,005	159,501
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	40,539	13,657
Available for sale securities, contractual maturities, Total	40,539	13,657
U.S. Government Agency Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	3,943
Available for sale securities, contractual maturities between 1 to 5 years	24,025	25,171
Available for sale securities, contractual maturities between 5 to 10 years	3,422	16,809
Available for sale securities, contractual maturities, Total	31,390	41,980
Emerging Markets [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities between 1 to 5 years	1,982
Available for sale securities, contractual maturities, Total	1,982
Asset Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities between 1 to 5 years	9	108
Available for sale securities, contractual maturities between 5 to 10 years	2,113	2,200
Available for sale securities, contractual maturities after 10 years	10,859	27,295
Available for sale securities, contractual maturities, Total	12,981	29,603
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities [Line Items]
Available for sale securities, contractual maturities less than 1 year	440	953
Available for sale securities, contractual maturities between 1 to 5 years	3,405	4,295
Available for sale securities, contractual maturities between 5 to 10 years	53,412	62,024
Available for sale securities, contractual maturities, Total	$ 57,257	$ 67,272

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Mortgage Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Average contractual maturity period	24 years	23 years

Property, Equipment and Softw_3

Property, Equipment and Software - Summary of Property, Equipment and Software (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 76,308	$ 66,318
Less accumulated depreciation and amortization	(31,844)	(31,531)
Property, Plant and Equipment, Gross	44,464	34,787
Land	1,490	1,490
Property, Plant and Equipment, Net	45,954	36,277
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	16,862	16,857
Equipment, Office Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	24,407	14,671
Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	6,408	11,458
Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 28,631	$ 23,332

Property, Equipment and Softw_4

Property, Equipment and Software - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 3.4	$ 3.1	$ 3.4
Amortization of capitalized software development costs	2.8	2.2	1.4
Capitalized software development costs	$ 5.3	$ 5	$ 6

Workers' Compensation Claims -

Workers' Compensation Claims - Summarizes Aggregate Workers' Compensation Reserve Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Workers Compensation Reserve [Abstract]
Workers' compensation claims liabilities, Beginning balance	$ 279,407	$ 357,746	$ 438,986
Add: claims expense accrual
Current period	19,146	75,786	147,097
Prior periods	(11,337)	(9,225)	(6,383)
Total expense accrual	7,809	66,561	140,714
Less: claim payments related to
Current period	4,450	15,063	22,877
Prior periods	67,581	129,138	198,620
Total paid	72,031	144,201	221,497
Change in claims incurred in excess of retention limits	802	(699)	(457)
Workers' compensation claims liabilities, Ending balance	215,987	279,407	357,746
Incurred but not reported (IBNR)	$ 110,824	$ 153,838	$ 210,798
Ratio of IBNR to workers' compensation claims liabilities	51%	55%	59%

Workers' Compensation Claims _2

Workers' Compensation Claims - Additional Information (Detail) - USD ($)			6 Months Ended	12 Months Ended
	Jul. 01, 2021	Jun. 29, 2020	Jun. 30, 2020	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Description of renewed agreement						The Company entered into a new arrangement for its insured program effective July 1, 2021 whereby th
Workers' Compensation Liability					$ 215,987,000		$ 279,407,000	$ 357,746,000	$ 438,986,000
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely					7,500,000
Balance in Chubb trust accounts		$ 115,700,000			188,200,000		273,600,000
Workers compensation liability					215,987,000		279,407,000	$ 357,746,000	$ 438,986,000
Workers compensation liability, current					62,917,000		80,028,000
Collateral securities maintain to cover potential workers compensation claims losses					54,500,000		58,400,000
Surety bonds and standby letters of credit					54,500,000
Reserves incurred in excess of retention limits					3,000,000		2,200,000
2021-2022 Policy [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum savings amount for twelve month policy period, if claims develop favorably						$ 20,000,000
2022-2023 Policy [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum savings amount for twelve month policy period, if claims develop favorably				$ 22,500,000
Maximum additional premium charged amount for twelve month policy period, if claims develop adversely				$ 0
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					3,000,000		$ 2,200,000
California [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Surety bonds and standby letters of credit					$ 22,300,000
Insured Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of worker's compensation exposure covered					83%
Description of renewed agreement				Effective July 1, 2022, the Company renewed the arrangement for its insured program, which now continues through June 30, 2023 (the “2022-2023 Policy”). Under the renewed arrangement, the Company can participate in savings up to $22.5 million for the twelve-month policy period. For the 2022-2023 Policy, no additional premium may be charged if claims develop adversely. The 2022-2023 Policy includes a renewal commitment through June 30, 2024.
Workers' Compensation Liability					$ 53,100,000
Worker's compensation risk claim maximum	$ 3,000,000
Worker's compensation risk claim maximum		$ 5,000,000
Workers compensation liability					$ 53,100,000
Self Insured Programs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of worker's compensation exposure covered					17%
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
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

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)	12 Months Ended
	Dec. 31, 2022
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

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)	12 Months Ended
	Dec. 31, 2022
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	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Jun. 29, 2020
Line of Credit Facility [Line Items]
Line of credit facility commitment fee description		The Agreement also provides for an unused commitment fee of 0.30% 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.
Balance in Chubb trust accounts	$ 188,200,000	$ 188,200,000	$ 273,600,000	$ 115,700,000
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	100,000,000
Minimum [Member] | Agreement [Member]
Line of Credit Facility [Line Items]
EBITDA	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] | 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		0.30%
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]
SOFR plus rate		1.75%
Standby Letters of Credit [Member] | Agreement [Member]
Line of Credit Facility [Line Items]
Credit facility borrowing capacity	$ 8,000,000	$ 8,000,000
Line of Credit [Member] | Agreement [Member]
Line of Credit Facility [Line Items]
Unused commitment fee on unused amount		1.75%
Term Loan [Member] | Agreement [Member]
Line of Credit Facility [Line Items]
Term loan with principal bank			$ 3,500,000

Benefit Plans - Additional Info

Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Discretionary Company contributions	$ 0	$ 0	$ 0
Employer matching contribution	2,100,000	1,900,000	$ 1,800,000
Long term portion of deferred compensation plan liability	5,800,000	6,300,000
Current portion of deferred compensation plan liability	1,000,000	200,000
Fair value of long term portion of deferred compensation plan liability	6,700,000	6,300,000
Fair value of current portion of deferred compensation plan liability	$ 1,000,000	$ 200,000

Leases - Additional Information

Leases - Additional Information (Detail) $ in Millions	Dec. 31, 2022 USD ($)
Lessee Lease Description [Line Items]
Operating lease not yet commenced	$ 1.7
Term of operating lease not yet commenced	5 years
Minimum [Member]
Lessee Lease Description [Line Items]
Remaining lease term, operating lease	1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Remaining lease term, operating lease	7 years

Leases - Summary of Lease Costs

Leases - Summary of Lease Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Lease, Cost [Abstract]
Operating lease cost	$ 7,747	$ 8,957
Variable lease cost	1,310	689
Short-term lease cost	165	94
Total lease cost	$ 9,222	$ 9,740

Leases - Summary of Information

Leases - Summary of Information Related to ROU Assets and Related Lease Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Assets and Liabilities, Lessee [Abstract]
Cash paid for operating lease liabilities	$ 7,607	$ 8,854
Right-of-use assets obtained in exchange for new operating lease obligations	$ 6,591	$ 5,717
Weighted-average remaining lease term	3 years 9 months 18 days	3 years 7 months 6 days
Weighted-average discount rate	4.10%	3.60%

Leases - Reconciliation of Undi

Leases - Reconciliation of Undiscounted Future Minimum Lease Payments Under Noncancellable Operating Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Lessee, Operating Lease, Liability, to be Paid [Abstract]
2023	$ 7,624
2024	5,915
2025	3,747
2026	2,685
2027	1,859
Thereafter	1,027
Total undiscounted future minimum lease payments	22,857
Less: Difference between undiscounted lease payments and discounted operating lease liabilities	1,675
Total operating lease liabilities	21,182
Current operating lease liabilities	6,957	$ 7,191
Long-term operating lease liabilities	$ 14,225	$ 14,598

Income Taxes - Summary of Provi

Income Taxes - Summary of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 14,683	$ 9,527	$ 2,943
State	5,529	3,408	396
Current income tax expense	20,212	12,935	3,339
Deferred:
Federal	(1,096)	143	4,156
State	(1,081)	(496)	1,336
Deferred income taxes	(2,177)	(353)	5,492
Total provision	$ 18,035	$ 12,582	$ 8,831

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred income tax assets:
Tax effect of unrealized losses (gains), net	$ 10,565	$ (393)
Workers' compensation claims liabilities	7,459	7,870
Deferred compensation	7,347	6,109
Operating lease liability	5,813	5,870
MCC accrual	2,173	167
Other	1,254	1,388
Equity based compensation	743	678
State credit carryforward	54	329
Customer incentives	6	12
Payroll tax deferral		749
Deferred tax assets, gross total	35,414	22,779
Less: valuation allowance		163
Deferred tax assets, net total	35,414	22,616
Deferred income tax liabilities:
Tax amortization of goodwill	(9,377)	(10,120)
Tax depreciation in excess of book depreciation	(8,914)	(7,433)
Operating lease right-of-use	(5,316)	(5,527)
Other	(367)	(1,223)
Deferred Tax Liabilities, gross total	(23,974)	(24,303)
Net deferred income taxes	$ 11,440
Net deferred income taxes		$ (1,687)

Income Taxes - Summary of Effec

Income Taxes - Summary of Effective Tax Rate Differed from U.S. Statutory Federal Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Statutory federal tax rate	21%	21%	21%
State taxes, net of federal benefit	5.40%	4.50%	3.20%
Nondeductible expenses and other, net	1.50%	0.50%	0.70%
Adjustment for final positions on filed returns	0.20%	0.90%	0.60%
Federal and state tax credits	(0.50%)	(2.10%)	(4.90%)
Other, net			0.10%
Effective tax rate	27.60%	24.80%	20.70%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended		48 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Income tax examination estimated penalty			$ 1,700,000
Gross unrecognized tax benefits	$ 600,000
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		$ 200,000	$ 5,500,000
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	2020

Stock Incentive Plans - Additio

Stock Incentive Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2022 USD ($) Installment shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New grants of stock option | shares	0
Outstanding options expiration period from the date of grant	10 years
Share-based compensation expense included in selling, general and administrative expenses	$ 7,400,000	$ 5,400,000	$ 3,400,000
Share-based compensation, income tax benefits	$ 1,200,000	$ 1,300,000	$ 800,000
2019 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance | shares	273,000
Percentage in payroll deductions to acquire shares	15%
Discount rate of fair market value available for share purchase	85%
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding options exercisable period after date of grant	10 years
Stock options granted | shares	0	0	0
Intrinsic value of stock options exercised	$ 200,000	$ 1,700,000	$ 4,100,000
Fair value of shares vested during the period	728,000	0	43,000
Unrecognized compensation expense	$ 1,900,000
Weighted average remaining amortization period	3 years 2 months 12 days
Stock Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock options vesting period	8 years
Stock Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock options vesting period	4 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding options exercisable period after date of grant	1 year
Fair value of shares vested during the period	$ 4,500,000	3,600,000	3,800,000
Unrecognized compensation expense	$ 11,000,000
Weighted average remaining amortization period	2 years 8 months 12 days
Number of equal annual installments in which restricted stock units generally vest | Installment	4
Performance Share Units ("PSUs") [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares vested during the period	$ 259,000	$ 276,000	$ 743,000
Vesting period	3 years
Maximum payout percentage	200%
Two Thousand And Twenty Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance | shares	375,000
Aggregate number of shares for which incentive stock options may be granted under the Plan | shares	375,000
Two Thousand And Fifteen Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant | shares	77,715

Stock Incentive Plans - Summary

Stock Incentive Plans - Summary of Stock Options Activity (Detail) - Stock Options [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding beginning balance, Number of Options | shares	104,875
Options exercised, Number of Options | shares	(3,750)
Outstanding ending balance, Number of Options | shares	101,125
Number of Options, exercisable stock options | shares	41,125
Outstanding beginning balance, Weighted Average Exercise Price | $ / shares	$ 68.91
Options exercised, Weighted Average Exercise Price | $ / shares	17.55
Outstanding ending balance, Weighted Average Exercise Price | $ / shares	70.81
Weighted Average Exercise Price, exercisable stock options | $ / shares	$ 54.18
Weighted Average Remaining Contractual Term of outstanding stock options	4 years 6 months 21 days
Weighted Average Remaining Contractual Term of exercisable stock options	3 years 6 months 29 days
Aggregate Intrinsic Value, outstanding stock option | $	$ 2,272
Aggregate Intrinsic Value, exercisable stock option | $	$ 1,608

Stock Incentive Plans - Schedul

Stock Incentive Plans - Schedule of Restricted Stock Unit Activity (Detail) - Restricted Stock Units [Member]	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested beginning balance, Units | shares	196,064
Granted, Units | shares	87,216
Vested, Units | shares	(66,723)
Cancelled/Forfeited, Units | shares	(5,575)
Nonvested ending balance, Units | shares	210,982
Nonvested beginning balance, Weighted Average Grant Date Fair Value | $ / shares	$ 65.38
Granted, Weighted Average Grant Date Fair Value | $ / shares	74.22
Vested, Weighted Average Grant Date Fair Value | $ / shares	68.01
Cancelled/Forfeited, Weighted Average Grant Date Fair Value | $ / shares	60.58
Nonvested ending balance, Weighted Average Grant Date Fair Value | $ / shares	$ 68.33

Stock Incentive Plans - Sched_2

Stock Incentive Plans - Schedule of Performance Share Unit Activity (Detail) - Performance Share Units ("PSUs") [Member]	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested beginning balance, Units | shares	34,333
Granted, Units | shares	24,147
Vested, Units | shares	(3,592)
Cancelled/Forfeited, Units | shares	(920)
Nonvested ending balance, Units | shares	53,968
Nonvested beginning balance, Weighted Average Grant Date Fair Value | $ / shares	$ 69.54
Granted, Weighted Average Grant Date Fair Value | $ / shares	60.15
Vested, Weighted Average Grant Date Fair Value | $ / shares	72.02
Cancelled/Forfeited, Weighted Average Grant Date Fair Value | $ / shares	72.02
Nonvested ending balance, Weighted Average Grant Date Fair Value | $ / shares	$ 65.13

Stock Repurchase Program - Addi

Stock Repurchase Program - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Feb. 28, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity Class Of Treasury Stock [Line Items]
Cost of repurchase	75,000,000
Company repurchase of common stock, shares		605,937	237,587	144,470
Aggregate purchase price		$ 47,168	$ 17,287	$ 8,056
Vested restricted stock units withheld for tax withholding obligations		23,113	20,308	25,922
Period of stock repurchase program	2 years
Stock repurchase program beginning date	Feb. 28, 2022

Litigation - Additional Informa

Litigation - Additional Information (Detail) $ in Millions	Dec. 31, 2022 USD ($)
Accrued Liabilities [Member]
Loss Contingencies [Line Items]
Estimated liability	$ 3.5