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Insurance Operations - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
UPCIC (1) (2) |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Dividend paid to immediate parent company |  |  | $ 0 | $ 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% | 10.00% |  |  |
UPCIC and APPCIC | Minimum |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Minimum capitalization amount | $ 15,000,000 |  |  | $ 10,000,000 |

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