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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S. federal tax statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal income tax benefit, rate	5.11%	2.81%	2.06%
Non-deductible stock-based compensation (shortfall)	(10.17%)	0.00%	0.00%
Other, rate	(1.34%)	(0.05%)	0.14%
Annual effective tax expense (benefit), rate	28.60%	37.76%	37.20%
U.S. federal tax statutory rate, amount	$ (19,730)	$ 285,064	$ 127,056
State income taxes, net of federal income tax benefit, amount	(2,883)	22,901	7,469
Non-deductible stock-based compensation (shortfall), amount	5,734	0	0
Other, amount	756	(374)	533
Total income tax expense (benefit)	$ (16,123)	$ 307,591	$ 135,058

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

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