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Insurance Operations - Beginning and Ending Balances and Changes in DPAC, Net of DRCC (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Insurance [Abstract]        
DPAC, beginning of period $ 67,190 $ 62,181 $ 60,019 $ 54,603
Capitalized Costs 33,227 30,846 100,444 91,135
Amortization of DPAC (32,117) (30,024) (92,163) (82,735)
DPAC, end of period 68,300 63,003 68,300 63,003
DRCC, beginning of period       28,943
Ceding Commissions Written       (5,276)
Earned Ceding Commissions       (23,667)
DPAC (DRCC), net, beginning of period 67,190 62,181 60,019 25,660
Capitalized Costs, net 33,227 30,846 100,444 96,411
Amortization of DPAC (DRCC), net (32,117) (30,024) (92,163) (59,068)
DPAC (DRCC), net, end of period $ 68,300 $ 63,003 $ 68,300 $ 63,003