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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Claims Development [Line Items]        
Increase (decrease) in unpaid losses and loss adjustment expenses $ (528,673,000) $ 692,574,000 $ 23,751,000  
Unpaid losses and loss adjustment expenses 510,117,000 1,038,790,000 346,216,000 $ 322,465,000
Incurred (recovered) related to prior year $ 110,573,000 24,980,000 $ 54,450,000  
Insurance claim maximum settlement time 1 year      
Initial case reserve for claims $ 2,500      
LAE case reserves 0      
Subrogation        
Claims Development [Line Items]        
Subrogation recoveries value $ 144,100,000 $ 134,400,000