Insurance Operations - Beginning and Ending Balances and Changes in DPAC, Net of DRCC (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Insurance [Abstract]
DPAC, beginning of period	$ 55,391	$ 51,872	$ 54,431
DPAC, beginning of period, Adjusted				50,200
Capitalized costs	30,241	29,536	58,933	55,680
Amortization of DPAC	(26,599)	(24,486)	(54,331)	(48,958)
DPAC, end of period	59,033	56,922	59,033	56,922
DRCC, beginning of period	38,014	40,074	37,149
DRCC, beginning of period, Adjusted				38,845
Ceding commissions written	26,222	21,286	48,534	44,775
Earned ceding commissions	(22,444)	(22,182)	(43,891)	(44,442)
DRCC, end of period	41,792	39,178	41,792	39,178
DPAC (DRCC), net, beginning of period	17,377	11,798	17,282
DPAC (DRCC), net, beginning of period, Adjusted				11,355
Capitalized costs, net	4,019	8,250	10,399	10,905
Amortization of DPAC (DRCC), net	(4,155)	(2,304)	(10,440)	(4,516)
DPAC (DRCC), net, end of period	$ 17,241	$ 17,744	$ 17,241	$ 17,744