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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]                        
Reserves for Unpaid Losses and LAE $ 267,760       $ 472,829       $ 267,760 $ 472,829 $ 248,425 $ 58,494
Incurred Loss and LAE Current Year                 515,338 314,933 322,929  
Incurred Loss and LAE Prior Years                 88,068 99,522 27,499  
Paid Losses and LAE                 538,331 401,011 342,796  
Net Investment Income 7,578 $ 7,613 $ 7,410 $ 8,142 7,603 $ 6,642 $ 5,786 $ 4,785 30,743 24,816 13,460  
Deferred Policy Acquisition Cost (“DPAC”) 91,882       84,686       91,882 84,686 73,059 $ 64,912
Amortization of DPAC, Net                 (176,843) (163,187) (136,702)  
Net Premiums Written                 869,645 827,674 737,060  
Net Premiums Earned 215,819 $ 206,599 $ 210,357 $ 209,727 204,595 $ 188,938 $ 192,272 $ 182,577 842,502 768,382 688,793  
Unearned premiums $ 661,279       $ 601,679       $ 661,279 $ 601,679 $ 532,444