Losses and Loss Adjustment Expenses Incurred and Paid - Information Regarding the Reserve for Unpaid Losses and LAE (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2011
Insurance [Abstract]
Liability for unpaid losses and LAE at beginning of period, gross	$ 68,424	$ 79,260	$ 69,436	$ 73,198
Reinsurance balances receivable, beginning balance	(133)	(260)	(187)	(46)
Liability for unpaid losses and LAE at beginning of period, net	68,291	79,000	69,249	73,152
Add: Provision for losses and LAE:
Current period	60,162	145,877	144,207	130,888
Prior periods	5,591	(3,038)	4,016	(1,721)
Net losses and LAE incurred	65,753	142,839	148,223	129,167
Less: Losses and LAE paid:
Current period	32,022	88,726	89,157	84,736
Prior periods	32,773	49,132	49,315	49,292
Net losses and LAE paid	64,795	137,858	138,472	134,028
Liability for unpaid losses and LAE at end of period, net	69,249	83,981	79,000	68,291
Reinsurance balances receivable, ending balance	187	305	260	133
Liability for unpaid losses and LAE at end of period, gross	$ 69,436	$ 84,286	$ 79,260	$ 68,424