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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Supplemental Information For Property Casualty Insurance Underwriters [Abstract]                        
Reserves for Unpaid Losses and LAE $ 248,425       $ 58,494       $ 248,425 $ 58,494 $ 98,840 $ 134,353
Incurred Loss and LAE Current Year                 322,929 305,919 188,040  
Incurred Loss and LAE Prior Years                 27,499 (4,690) (301)  
Paid Losses and LAE                 342,796 328,141 189,442  
Net Investment Income 4,448 $ 3,085 $ 3,223 $ 2,704 3,489 $ 2,304 $ 2,142 $ 1,605 13,460 9,540 5,155  
Deferred Policy Acquisition Cost ("DPAC") 73,059       64,912       73,059 64,912 60,019 $ 25,660
Amortization of DPAC                 (136,702) (125,350) (87,871)  
Net Premiums Written                 737,060 656,094 626,448  
Net Premiums Earned 183,708 $ 174,517 $ 169,009 $ 161,559 163,973 $ 159,534 $ 156,461 $ 152,448 688,793 632,416 503,999  
Unearned premiums $ 532,444       $ 475,756       $ 532,444 $ 475,756 $ 442,366