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Summary of Operations and Significant Accounting Policies - Additional Information (Detail) |  |  |  | 12 Months Ended |
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Jun. 04, 2024 $ / shares shares | Jun. 03, 2024 shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) Company Market Segment $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |  |  |  |
Number of markets | Market |  |  |  | 67 |  |  |
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. |  |  |
Stock split, conversion ratio | 0.25 | 0.25 |  | 0.25 |  |  |
Common stock, shares authorized | shares | 82,000,000 | 20,500,000 | 82,000,000 | 82,000,000 | 82,000,000 |  |
Common stock, par value | $ / shares | $ 0.01 |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
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 |  |  |
Interest income |  |  |  | $ 10,900,000 | $ 9,100,000 | $ 6,800,000 |
Payroll weekly payment term |  |  |  | 30 days |  |  |
Unbilled receivables |  |  | $ 157,900,000 | $ 218,800,000 | 157,900,000 |  |
Remaining trade accounts receivable |  |  | 14,400,000 | 16,600,000 | 14,400,000 |  |
Allowance for expected credit losses |  |  | 885,000 | 885,000 | 885,000 | 893,000 | $ 460,000
Goodwill and intangible assets impairment |  |  |  | 0 |  |  |
Impairment of long lived asset |  |  |  | 0 |  |  |
Income taxes paid |  |  |  | 14,900,000 | 22,200,000 | 21,000,000.0 |
Accrued payroll, payroll taxes and related benefits |  |  | 234,100,000 |  | 234,100,000 |  |
Accrued payroll and related benefits |  |  | 160,930,000 | 215,648,000 | 160,930,000 |  |
Payroll taxes payable |  |  | 73,200,000 |  | 73,200,000 |  |
Net cash inflows from accrued payroll, payroll taxes and related benefit |  |  |  |  | 12,700,000 | 24,900,000 |
Net cash inflows related to accrued payroll and related benefits |  |  |  |  | 5,700,000 | 12,200,000 |
Net cash inflows related to payroll taxes payable |  |  |  | $ (23,465,000) | 7,030,000 | 12,697,000 |
Prior period reclassification adjustment |  |  |  |  | $ 800,000 | $ 2,300,000 |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |  |  |  |
Prior period reclassification adjustment |  |  | 200,000 |  |  |  |
Safety Incentive Liability [Member] |  |  |  |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |  |  |  |
Prior period reclassification adjustment |  |  | $ 1,300,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |  |  |  |
Likelihood of tax benefit being realized upon settlement |  |  |  | 50.00% |  |  |
California [Member] | Revenue [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |
Basis Of Presentation Of Interim Period Statements [Line Items] |  |  |  |  |  |  |
Percentage of revenue attributable to geographic area |  |  |  | 72.00% | 72.00% | 73.00% |

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