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Losses and Loss Adjustment Expenses - Losses and LAE (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Liability For Unpaid Claims And Claims Adjustment Expense Net [Abstract]          
Net balance, beginning of period* $ 123,129 $ 95,345 $ 98,174 $ 94,826  
Incurred, net of reinsurance, related to:          
Current period 50,543 25,177 116,839 70,914  
Prior period 1,200 2,150 2,825 7,702  
Total incurred, net of reinsurance 51,743 27,327 119,664 78,616  
Paid, net of reinsurance, related to:          
Current period (21,175) (15,111) (36,988) (32,819)  
Prior period (9,386) (12,763) (36,539) (45,825)  
Total paid, net of reinsurance (30,561) (27,874) (73,527) (78,644)  
Net balance, end of period 144,311 94,798 144,311 94,798  
Add: reinsurance recoverable before allowance for credit losses 75,034 143,123 75,034 143,123  
Gross balance, end of period $ 219,345 $ 237,921 $ 219,345 $ 237,921 $ 214,697