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Liability for Unpaid Losses and Loss Adjustment Expenses - Narrative (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Direct losses and loss adjustment expenses $ 276,302 $ 162,446 $ 513,600 $ 335,689
Incurred related to prior years 7,731 478 6,494 4,819
Ceded losses and loss adjustment expenses 109,081 11,101 202,416 49,296
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 116,900   209,000  
Incurred related to prior years 7,700   6,500  
Ceded losses and loss adjustment expenses 109,200   202,500  
Hurricane        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Direct losses and loss adjustment expenses 109,100 11,600 201,200 54,100
Incurred related to prior years (100) 500 (1,300) 4,800
Ceded losses and loss adjustment expenses 109,200 $ 11,100 202,500 $ 49,300
Settlement on Litigated Claims        
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Incurred related to prior years $ 7,800   $ 7,800