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Schedule II - Condensed Financial Information of Registrant - General - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 08, 2024 | Feb. 28, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend paid to immediate parent company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 164,100,000 | $ 231,900,000 | $ 149,900,000
Cash dividend declared per common share (in USD per share) |  |  | $ 0.29 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.29 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.29 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.77 | $ 0.77 | $ 0.77
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared per common share (in USD per share) | $ 0.16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution to subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 89,490,000 | $ 129,490,000 | $ 95,498,000
Dividend paid to immediate parent company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 164,100,000 | 231,900,000 | 149,900,000
Issuance of note receivable to subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 114,000,000 | 20,000,000
Surplus accrued variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.54% |  |
Parent Company | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared per common share (in USD per share) |  | $ 0.16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated Surplus Debenture | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note receivable to subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 134,000,000 |  |
UPCIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution to subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72,000,000 | 84,000,000 | 92,000,000
Dividend paid to immediate parent company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
UPCIC | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution to subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72,000,000 | 84,000,000 | 92,000,000
Dividend paid to immediate parent company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
UPCIC | Subordinated Surplus Debenture | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note receivable to subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 110,000,000 |
APPCIC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution to subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 3,000,000 | 0
Dividend paid to immediate parent company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
APPCIC | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution to subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 3,000,000 | $ 0
APPCIC | Subordinated Surplus Debenture | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note receivable to subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 4,000,000 |

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