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Income Taxes - Schedule of Differences Between Effective Rate and United States Federal Income Tax Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Tax at statutory rate	35.00%	35.00%	35.00%
State income tax, net of federal benefit	2.63%	2.60%	2.66%
Non-deductible expenses	0.27%	0.36%	0.32%
Change in accrual estimates relating to uncertain tax positions	(0.48%)	(0.15%)	0.44%
Other, net	0.02%	0.13%	(0.13%)
Income tax provision	37.44%	37.94%	38.29%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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