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Liability for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Dec. 31, 2023
Mar. 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     $ (165,500)          
Unpaid losses and loss adjustment expenses $ 344,648 $ 663,019 344,648 $ 663,019 $ 429,629 $ 510,117 $ 870,407 $ 1,038,790
Direct losses and loss adjustment expenses 253,613 253,079 493,932 461,301        
Ceded losses and loss adjustment expenses 10,041 29,352 10,173 31,420        
Incurred related to prior years 0 13,825 $ 0 $ 17,143        
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 10,000 43,100            
Ceded losses and loss adjustment expenses   29,400            
Incurred related to prior years $ 0 $ 13,800