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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Increase (decrease) in liability for claims and claims adjustment expense reserve $ (80,500,000)      
Unpaid losses and loss adjustment expenses 429,629,000 $ 870,407,000 $ 510,117,000 $ 1,038,790,000
Direct losses and loss adjustment expenses 240,319,000 208,222,000    
Ceded losses and loss adjustment expenses 132,000 2,068,000    
Incurred related to prior years 0 3,318,000    
Adverse Prior Years' Reserve Development        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Direct losses and loss adjustment expenses 93,000.0 5,400,000    
Ceded losses and loss adjustment expenses   2,100,000    
Incurred related to prior years $ 0 $ 3,300,000