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Income Taxes - Difference Between Total Tax Expense and Amount Computed by Applying Statutory Federal Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Rate Reconciliation [Line Items]
Statutory rate applied to income	$ 356,626	$ 311,782	$ 266,624
Plus state income taxes, net of Federal tax benefit	30,227	26,790	24,621
Other	(15,962)	(12,882)	(4,973)
Income tax expense, total	$ 370,891	$ 325,690	$ 286,272

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

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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