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Insurance Operations - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
UPCIC |  |
Statutory Accounting Practices [Line Items] |  |
Dividend paid to immediate parent company | $ 0.0 |
APPCIC |  |
Statutory Accounting Practices [Line Items] |  |
Dividend paid to immediate parent company |  | $ 0.0
UPCIC and APPCIC |  |
Statutory Accounting Practices [Line Items] |  |
Minimum capitalization rate | 10.00% |
UPCIC and APPCIC | Minimum |  |
Statutory Accounting Practices [Line Items] |  |
Minimum capitalization amount | $ 15.0 |

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