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Insurance Operations - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
UPCIC |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Dividends |  |  | $ 0 | $ 0 |  |
APPCIC |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Dividends |  | $ 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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