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Schedule II - Condensed Financial Information of Registrant - General - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Statutory Accounting Practices [Line Items] |  |  |  |
Dividend paid to immediate parent company |  | $ 231,900,000 | $ 149,900,000 | $ 151,000,000
Surplus insurance entities |  | $ (141,777,000) | (102,515,000) | (104,339,000)
Surplus accrued variable rate |  | 8.27% |  |
Subordinated Surplus Debenture |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Issuance of note receivable to subsidiary |  | $ 134,000,000 |  |
UPCIC |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Capital contribution to subsidiaries |  | 84,000,000 | 92,000,000 | 114,000,000
Dividend paid to immediate parent company |  | 0 | 0 | 0
UPCIC | Subsequent Event |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Capital contribution to subsidiaries | $ 72,000,000 |  |  |
UPCIC | Subordinated Surplus Debenture |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Issuance of note receivable to subsidiary |  | 110,000,000 | 20,000,000 |
APPCIC |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Capital contribution to subsidiaries |  | 3,000,000 | 0 | $ 0
Dividend paid to immediate parent company |  | 0 | $ 0 |
APPCIC | Subordinated Surplus Debenture |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |
Issuance of note receivable to subsidiary |  | $ 4,000,000 |  |

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- Definition The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585 + Details
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