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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2024
USD ($)
Entity
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Significant Accounting Policies [Line Items]      
Ownership interest exceeds respective investments 3.00%    
Investments in other invested assets $ 29,413,000 $ 38,236,000  
Cash and cash equivalents 17,009,000 38,037,000  
Allowance for expected credit losses 3,530,000 4,796,000 $ 3,322,000
Allowance for expected credit losses on reinsurance receivables 8,992,000 8,992,000  
Amortization of deferred acquisition costs 87,600,000 120,900,000 150,900,000
Premium deficiency reserve 0 0  
Net foreign currency transaction gains (losses) 100,000 (500,000) 300,000
Capitalized software costs 10,000,000 4,000,000  
Amortization expense 4,400,000 4,900,000 $ 6,100,000
Money Market Funds      
Significant Accounting Policies [Line Items]      
Cash and cash equivalents $ 15,300,000 36,900,000  
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 $ 3,500,000 $ 7,500,000