Income Taxes (Components of Tax Rate Reconciliation) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income tax at federal statutory rate (35%)													$ 3,807	$ 1,413	$ 24,293
State income taxes, net of federal benefits													111	436	2,946
Stock-based compensation													130	49	230
Warrant valuation													287	(485)	0
Nondeductible initial public offering related expenses													0	3,127	0
Other													(385)	40	(23)
Income tax expense	$ (56)	$ 856	$ 1,813	$ 1,337	$ 1,541	$ 230	$ 1,733	$ 1,076	$ 3,578	$ 20,648	$ 1,143	$ 2,077	$ 3,950	$ 4,580	$ 27,446