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Insurance Operations - Beginning and Ending Balances and Changes in DPAC, Net of DRCC (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Insurance [Abstract]        
DPAC, beginning of period $ 56,183 $ 54,211 $ 54,603 $ 54,099
Capitalized Costs 31,722 29,993 60,289 56,775
Amortization of DPAC (25,724) (26,055) (52,711) (52,725)
DPAC, end of period 62,181 58,149 62,181 58,149
DRCC, beginning of period 29,988 38,318 28,943 38,200
Ceding Commissions Written (22,938) 10,439 (5,276) 32,319
Earned Ceding Commissions (7,050) (18,685) (23,667) (40,447)
DRCC, end of period   30,072   30,072
DPAC (DRCC), net, beginning of period 26,195 15,893 25,660 15,899
Capitalized Costs, net 54,660 19,554 65,565 24,456
Amortization of DPAC (DRCC), net (18,674) (7,370) (29,044) (12,278)
DPAC (DRCC), net, end of period $ 62,181 $ 28,077 $ 62,181 $ 28,077