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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Insurance [Abstract]      
DPAC, beginning of year $ 54,603 $ 54,099 $ 54,431
Capitalized Costs 116,954 108,072 109,981
Amortization of DPAC (111,538) (107,568) (110,313)
DPAC, end of year 60,019 54,603 54,099
DRCC, beginning of year 28,943 38,200 37,149
Ceding Commissions Written (5,276) 64,810 89,679
Earned Ceding Commissions (23,667) (74,067) (88,628)
DRCC, end of year   28,943 38,200
DPAC (DRCC), net, beginning of year 25,660 15,899 17,282
Capitalized Costs, net 122,230 43,262 20,302
Amortization of DPAC (DRCC), net (87,871) (33,501) (21,685)
DPAC (DRCC), net, end of year $ 60,019 $ 25,660 $ 15,899