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Insurance Operations - Beginning and Ending Balances and Changes in DPAC, Net of DRCC (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Insurance [Abstract]      
DPAC, beginning of year $ 60,019 $ 54,603 $ 54,099
Capitalized Costs 130,243 116,954 108,072
Amortization of DPAC (125,350) (111,538) (107,568)
DPAC, end of year 64,912 60,019 54,603
DRCC, beginning of year   28,943 38,200
Ceding Commissions Written   (5,276) 64,810
Earned Ceding Commissions   (23,667) (74,067)
DRCC, end of year     28,943
DPAC (DRCC), net, beginning of year 60,019 25,660 15,899
Capitalized Costs, net 130,243 122,230 43,262
Amortization of DPAC (DRCC), net (125,350) (87,871) (33,501)
DPAC (DRCC), net, end of year $ 64,912 $ 60,019 $ 25,660