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Schedule VI - Supplemental Information Concerning Consolidated Property and Casualty Insurance Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]                        
Reserves for Unpaid Losses and LAE $ 346,216       $ 322,465       $ 346,216 $ 322,465 $ 267,760 $ 472,829
Incurred Loss and LAE Current Year                 724,768 700,473 515,338  
Incurred (recovered) related to prior years                 54,437 58,337 88,068  
Paid Losses and LAE                 751,792 700,406 538,331  
Net investment income 3,894 $ 2,797 $ 2,858 $ 2,986 2,823 $ 4,557 $ 6,179 $ 6,834 12,535 20,393 30,743  
Deferred Policy Acquisition Cost (“DPAC”) 108,822       110,614       108,822 110,614 91,882 $ 84,686
Amortization of DPAC, Net                 (224,121) (199,154) (176,843)  
Net Premiums Written                 1,084,827 1,004,903 869,645  
Net Premiums Earned 271,332 $ 264,654 $ 256,172 $ 243,305 242,173 $ 234,191 $ 226,370 $ 220,829 1,035,463 923,563 842,502  
Unearned premiums $ 857,769       $ 783,135       $ 857,769 $ 783,135 $ 661,279