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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2022
USD ($)
Entity
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Significant Accounting Policies [Line Items]      
Ownership interest exceeds respective investments 3.00%    
Investments in other invested assets $ 38,176,000 $ 152,651,000  
Cash and cash equivalents 38,846,000 78,278,000  
Allowance for expected credit losses 3,322,000 2,996,000 $ 2,900,000
Allowance for expected credit losses on reinsurance receivables 8,992,000 8,992,000 8,992,000
Amortization of deferred acquisition costs 150,900,000 144,900,000 140,900,000
Premium deficiency reserve 0 0  
Net foreign currency transaction gains (losses) 300,000 500,000 $ 100,000
Money Market Funds      
Significant Accounting Policies [Line Items]      
Cash and cash equivalents $ 26,000,000.0 65,400,000  
Variable Interest Entity, Not Primary Beneficiary      
Significant Accounting Policies [Line Items]      
Ownership interest exceeds respective investments 3.00%    
Number of VIEs | Entity 2    
Other Assets      
Significant Accounting Policies [Line Items]      
Accrued interest receivable $ 8,400,000 $ 5,200,000