Income Taxes - Components of Provision for Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current provision:
Federal	$ 130,854	$ 126,484	$ 28,334
State	13,513	10,674	3,029
Total current provision	144,367	137,158	31,363
Deferred provision/(benefit):
Federal	13,240	(9,747)	2,969
State	1,327	(1,268)	79
Total deferred provision/(benefit)	14,567	(11,015)	3,048
Provision for income tax expense	$ 158,934	$ 126,143	$ 34,411

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

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

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

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

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

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.