Insurance Operations - Beginning and Ending Balances and Changes in DPAC, Net of DRCC (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Insurance [Abstract]
DPAC, beginning of year	$ 54,099	$ 54,431	$ 50,200
Capitalized Costs	108,072	109,981	107,180
Amortization of DPAC	(107,568)	(110,313)	(102,949)
DPAC, end of year	54,603	54,099	54,431
DRCC, beginning of year	38,200	37,149	38,845
Ceding Commissions Written	64,810	89,679	85,063
Earned Ceding Commissions	(74,067)	(88,628)	(86,759)
DRCC, end of year	28,943	38,200	37,149
DPAC (DRCC), net, beginning of year	15,899	17,282	11,355
Capitalized Costs, net	43,262	20,302	22,117
Amortization of DPAC (DRCC), net	(33,501)	(21,685)	(16,190)
DPAC (DRCC), net, end of year	$ 25,660	$ 15,899	$ 17,282