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Insurance Operations - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
UPCIC    
Statutory Accounting Practices [Line Items]    
Dividend paid to immediate parent company $ 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 $ 15.0