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Income Taxes - Income from Continuing Operations Before Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Provisions for income taxes at federal statutory rate	$ 31,697	$ 32,391	$ 45,567
State current and deferred income taxes	3,916	3,533	5,088
Domestic production activities deduction		(1,933)	(3,091)
Effect of tax return to tax provision reconciliation	(318)	(216)	(958)
Other	126	(181)	(398)
Provisions for income taxes	$ 35,421	$ 33,594	$ 46,208

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

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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