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Basis of Presentation of Interim Period Statements - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  | 6 Months Ended | 9 Months Ended | 12 Months Ended |
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Jun. 04, 2024 $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Jun. 30, 2024 | Sep. 30, 2024 USD ($) Company $ / shares shares | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) $ / shares shares | Jun. 03, 2024 shares
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |
Stock split, description |  |  |  | On June 4, 2024, we amended our Charter to increase the number of authorized shares of common stock from 20,500,000 shares to 82,000,000 shares, and our Board of Directors declared a four-for-one split of the Company’s common stock effected in the form of a stock dividend (the “2024 Stock Split”). Each stockholder of record at the close of business on June 14, 2024 received a dividend of three additional shares of common stock for each then-held share, distributed after close of trading on June 21, 2024. |  |  |
Common stock, shares authorized | shares | 82,000,000 | 82,000,000 |  | 82,000,000 |  | 82,000,000 | 20,500,000
Stock split, conversion ratio | 0.25 |  | 0.25 | 0.25 |  |  |
Common stock, par value | $ / shares | $ 0.01 | $ 0.01 |  | $ 0.01 |  | $ 0.01 |
Revenue recognition professional employer service contracts term |  |  |  | 1 year |  |  |
Professional employer service contract cancellation and termination period |  |  |  | 30 days |  |  |
Payment term for staffing customers |  |  |  | 30 days |  |  |
Number of wholly-owned insurance companies | Company |  |  |  | 2 |  |  |
Cash and cash equivalents, maturity term |  |  |  | 3 months |  |  |
Allowance for expected credit losses |  | $ 0.9 |  | $ 0.9 |  | $ 0.9 |
Income taxes paid |  |  |  | 8.0 | $ 13.0 |  |
Prior period reclassification adjustment |  | $ 1.3 |  | $ 0.6 |  | $ 0.2 |

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