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Liability for Unpaid Losses and Loss Adjustment Expenses - Change in Liability for Unpaid Losses and LAE (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Balance at beginning of period $ 322,465 $ 267,760
Less: Reinsurance recoverable (119,522) (123,221)
Net balance at beginning of period 202,943 144,539
Incurred related to current year 145,200 130,707
Incurred related to prior years (1,237) 4,341
Total incurred 143,963 135,048
Paid related to current year 54,481 61,778
Paid related to prior years 95,316 87,989
Total paid 149,797 149,767
Net balance at end of period 197,109 129,820
Plus: Reinsurance recoverable 118,671 66,158
Balance at end of period $ 315,780 $ 195,978