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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