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Basis of Presentation of Interim Period Statements - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 04, 2024 $ / shares shares | Sep. 30, 2025 USD ($) Company $ / shares shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Company Segment $ / shares shares | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) $ / shares shares | Jun. 03, 2024 shares
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |  |  |  |
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 |  | 2 |  |  |
Cash and cash equivalents, maturity term |  |  |  | 3 months |  |  |
Allowance for expected credit losses |  | $ 400 |  | $ 400 |  | $ 900 |
Income taxes paid net of income tax refunds received |  |  |  | $ 10,100 |  |  |
Income tax refunds received of income tax paid net |  |  |  |  | $ 6,800 |  |
Common stock, shares authorized | shares | 82,000,000 | 82,000,000 |  | 82,000,000 |  | 82,000,000 | 20,500,000
Stock split, conversion ratio | 0.25 |  |  |  |  |  |
Common stock, par value | $ / shares | $ 0.01 | $ 0.01 |  | $ 0.01 |  | $ 0.01 |
Stock split, description |  |  |  | On June 4, 2024, we amended our Charter to increase the number of authorized shares of common stock from 20,500,000 shares to 82,000,000 shares, and our Board of Directors declared a four-for-one split of the Company’s common stock effected in the form of a stock dividend (the “2024 Stock Split”). Each stockholder of record at the close of business on June 14, 2024 received a dividend of three additional shares of common stock for each then-held share, distributed after close of trading on June 21, 2024. |  |  |
Number of operating segment | Segment |  |  |  | 1 |  |  |
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] |  |  |  | srt:ChiefExecutiveOfficerMember |  |  |
Interest income |  | $ 1,900 | $ 2,200 | $ 6,800 | 8,400 |  |
Payroll weekly payment term |  |  |  | 30 days |  |  |
Unbilled receivables |  | 289,200 |  | $ 289,200 |  | $ 218,800 |
Remaining trade accounts receivable |  | $ 11,700 |  | 11,700 |  | $ 16,600 |
Accrued payroll, payroll taxes and related benefits |  |  |  |  | 35,000 |  |
Net cash inflows related to accrued payroll and related benefits |  |  |  |  | 73,500 |  |
Payroll taxes payable |  |  |  | (6,521) | $ (38,457) |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |  |  |  |
Prior period reclassification adjustment |  |  |  | $ 200 |  |  |

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