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Insurance Operations - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
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
UPCIC |  |  |
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% |  |
UPCIC and APPCIC | Minimum |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Minimum capitalization amount | $ 15,000,000 |  |

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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 Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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