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Liability for Unpaid Losses and Loss Adjustment Expenses - Change in Liability for Unpaid Losses and LAE (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Insurance Loss Reserves [Abstract]      
Balance at beginning of year $ 267,760 $ 472,829 $ 248,425
Less: Reinsurance recoverable (123,221) (393,365) (182,405)
Net balance at beginning of period 144,539 79,464 66,020
Incurred (recovered) related to current year 700,473 515,338 314,933
Incurred (recovered) related to prior years 58,337 88,068 99,522
Total incurred 758,810 603,406 414,455
Paid related to Current year 513,308 391,161 221,708
Paid related to Prior years 187,098 147,170 179,303
Total paid 700,406 538,331 401,011
Net balance at end of period 202,943 144,539 79,464
Plus: Reinsurance recoverable 119,522 123,221 393,365
Balance at end of year $ 322,465 $ 267,760 $ 472,829