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Insurance Operations - Statutory Capital and Surplus, and an Amount Representing Ten Percent of Total Liabilities for both UPCIC and APPCIC (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Mar. 31, 2022
Feb. 28, 2022
Oct. 31, 2021
Mar. 31, 2022
Dec. 31, 2021
Statutory Accounting Practices [Line Items]          
Subordinated debenture surplus funding   $ 90,000      
UPCIC          
Statutory Accounting Practices [Line Items]          
Statutory capital and surplus $ 389,248     $ 389,248 $ 378,750
Ten percent of total liabilities 114,748     114,748 122,292
Subordinated debenture surplus funding 20,000   $ 20,000    
Carrying amount of surplus debenture 130,000     130,000 110,000
APPCIC          
Statutory Accounting Practices [Line Items]          
Statutory capital and surplus 18,539     18,539 16,104
Ten percent of total liabilities 1,191     1,191 $ 649
Subordinated debenture surplus funding       3,000  
Carrying amount of surplus debenture $ 3,000     $ 3,000