Income Taxes - Provision (Benefit) for Income Taxes Differs from Amounts Computed by Applying Statutory Federal Corporate Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2011
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes at statutory rate	$ (10,251)		$ 3,440	$ (3,166)		$ (19,804)
Tax effect of:
Tax-exempt investment income	(2)		(27)	(18)		(15)
Change in the beginning of the period balance of the valuation allowance for deferred tax assets allocated to federal income taxes	4,670		(4,277)	580		4,761
Net operating loss carryforward expirations				1		735
Goodwill and identifiable intangible assets	5,545					14,084
Stock-based compensation	30		1,133	2,552		248
State income taxes, net of federal income tax benefit and valuation allowance	148		479	(5)		198
Other	8		(98)	51		(9)
Income tax expense (benefit)	$ 148	$ 241	$ 650	$ (5)	$ 105	$ 198