Components of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 188,302us-gaap_CurrentFederalTaxExpenseBenefit	$ 334,258us-gaap_CurrentFederalTaxExpenseBenefit	$ 239,232us-gaap_CurrentFederalTaxExpenseBenefit
State	30,789	68,715	49,178
International	1,687us-gaap_CurrentForeignTaxExpenseBenefit	1,764us-gaap_CurrentForeignTaxExpenseBenefit	660us-gaap_CurrentForeignTaxExpenseBenefit
Total current income tax	220,778us-gaap_CurrentIncomeTaxExpenseBenefit	404,737us-gaap_CurrentIncomeTaxExpenseBenefit	289,070us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	192,267	(6,695)	64,195
State	32,360	(8,941)	6,498
International	938	746
Total deferred income tax	225,565	(14,890)	70,693
Income Tax Expense (Benefit), Continuing Operations and Discontinued Operations, Total	$ 446,343	$ 389,847	$ 359,763

Income tax expense (benefit), continuing operations and discontinued operations.

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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