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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Supplemental Information For Property Casualty Insurance Underwriters [Abstract]                        
Reserves for Unpaid Losses and LAE $ 58,494       $ 98,840       $ 58,494 $ 98,840 $ 134,353 $ 159,222
Incurred Loss and LAE Current Year                 305,919 188,040 124,011  
Incurred Loss and LAE Prior Years                 (4,690) (301) (736)  
Paid Losses and LAE                 328,141 189,442 126,910  
Net Investment Income 3,489 $ 2,304 $ 2,142 $ 1,605 1,779 $ 1,307 $ 1,207 $ 862 9,540 5,155 2,375  
Deferred Policy Acquisition Cost ("DPAC") 64,912       60,019       64,912 60,019 25,660 $ 15,899
Amortization of DPAC                 (125,350) (87,871) (33,501)  
Net Premiums Written                 656,094 626,448 389,847  
Net Premiums Earned 163,973 $ 159,534 $ 156,461 $ 152,448 150,598 $ 146,153 $ 112,888 $ 94,360 632,416 503,999 326,877  
Unearned premiums $ 475,756       $ 442,366       $ 475,756 $ 442,366 $ 383,488