Income Taxes - Summary of Reconciliation Between Income Taxes and Effective Income Tax Provision (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Provision at federal statutory rate	$ 23,851	$ 17,899	$ 6,206
State income taxes, net	2,574	2,025	925
Nondeductible business expenses	675	503	406
Tax credits	(2,429)	(253)	(1,198)
Other, net	(153)	(1,083)	18
Total income tax (benefit) provision	$ 24,518	$ 19,091	$ 6,357