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Income Taxes - Tax Effects of Significant Temporary Differences Representing Net Deferred Tax Asset and Liability (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Property and equipment | $ 15,164 | $ 58,993
Net operating loss carryforwards | 339,914 | 255,571
Alternative minimum tax carryforward | 20,435 | 20,435
Unrealized hedging loss | 2,110 |
Gain on debt exchange | 20,194 |
Other | 8,523 | 7,895
Noncurrent deferred tax assets | 406,340 | 342,894
Valuation allowance on deferred tax assets | (398,120) | (330,372)
Deferred tax assets | 8,220 | 12,522
Deferred tax liabilities: |  |
Property and equipment | (9,203) | (9,047)
Unrealized hedging income |  | (506)
Original issue discount | (4,025) |
Other | (4,118) | (4,934)
Deferred tax liabilities | (17,346) | (14,487)
Net deferred tax liability | $ (9,126) | $ (1,965)

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