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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]                        
Reserves for Unpaid Losses and LAE $ 322,465       $ 267,760       $ 322,465 $ 267,760 $ 472,829 $ 248,425
Incurred Loss and LAE Current Year                 700,473 515,338 314,933  
Incurred (recovered) related to prior years                 58,337 88,068 99,522  
Paid Losses and LAE                 700,406 538,331 401,011  
Net investment income 2,823 $ 4,557 $ 6,179 $ 6,834 7,578 $ 7,613 $ 7,410 $ 8,142 20,393 30,743 24,816  
Deferred Policy Acquisition Cost (“DPAC”) 110,614       91,882       110,614 91,882 84,686 $ 73,059
Amortization of DPAC, Net                 (199,154) (176,843) (163,187)  
Net Premiums Written                 1,004,903 869,645 827,674  
Net Premiums Earned 242,173 $ 234,191 $ 226,370 $ 220,829 215,819 $ 206,599 $ 210,357 $ 209,727 923,563 842,502 768,382  
Unearned premiums $ 783,135       $ 661,279       $ 783,135 $ 661,279 $ 601,679