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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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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