Income Taxes - Schedule of Difference Between United States Federal Statutory Rate and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Federal income tax at statutory rate	35.00%	35.00%	35.00%
State income taxes, net of Federal tax benefit	3.80%	3.40%	3.60%
State law changes	0.00%	0.30%	0.30%
Acquisition transaction costs	0.00%	0.00%	1.60%
Nondeductible compensation expense	1.80%	0.00%	0.00%
Change in deferred income tax rates	(2.60%)	0.00%	0.00%
Interest on income tax refunds	0.00%	(0.10%)		0.00%
Change in valuation allowance	1.20%	1.40%	(87.30%)
Other	0.10%	1.40%	1.10%
Effective tax rate	39.30%	41.40%	(45.70%)