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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Insurance [Abstract]      
DPAC, beginning of year $ 64,912 $ 60,019 $ 54,603
Capitalized Costs 144,849 130,243 116,954
Amortization of DPAC (136,702) (125,350) (111,538)
DPAC, end of year 73,059 64,912 60,019
DRCC, beginning of year     28,943
Ceding Commissions Written     (5,276)
Earned Ceding Commissions     (23,667)
DPAC (DRCC), net, beginning of year 64,912 60,019 25,660
Capitalized Costs, net 144,849 130,243 122,230
Amortization of DPAC (DRCC), net (136,702) (125,350) (87,871)
DPAC (DRCC), net, end of year $ 73,059 $ 64,912 $ 60,019