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Schedule II - Condensed Financial Information of Registrant - General - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Feb. 28, 2022
Statutory Accounting Practices [Line Items] |  |  |  |  |
Capital Contributions - UPCIC |  | $ 92,000,000 | $ 114,000 | $ 0 |
Subordinated surplus debenture |  | 20,000,000 |  |  |
Received distributions from the earnings of subsidiaries |  | 149,900,000 | 151,000,000 | 121,300,000 |
Subsequent Event |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Subordinated surplus debenture |  |  |  |  | $ 90,000,000
UPCIC (1) (2) |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Capital Contributions - UPCIC | $ 77,000,000 | 92,000,000 | 114,000,000 | 0 |
Dividend paid to immediate parent company |  | 0 | 0 | $ 0 |
UPCIC (1) (2) | Subsequent Event |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Subordinated surplus debenture |  |  |  |  | $ 90,000,000
APPCIC |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Dividend paid to immediate parent company |  | $ 0 | $ 0 |  |

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- Definition This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 + Details
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- Definition The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Definition The cash inflow from parent as a source of financing that is recorded as additional paid in capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Debt obligation to borrow funds to provide itself with surplus funds. Subordinated debt places a lender in a lien position behind the primary lender of the company. + References No definition available. + Details
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