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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, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Asset retirement obligation | $ 4,061 | $ 3,812
Net operating loss carryforwards | 59,335 | 51,656
Interest expense limitation | 55,026 | 62,552
Unrealized hedging losses | 10,452 | 0
Other | 5,661 | 9,022
Noncurrent deferred tax assets | 134,535 | 127,042
Valuation allowance on deferred tax assets | (15,964) | (16,876)
Deferred tax assets | 118,571 | 110,166
Deferred tax liabilities: |  |
Property and equipment | (283,959) | (269,587)
Unrealized hedging income | 0 | (10,763)
Bond discount | (30,591) | (37,458)
Other | (4,604) | (4,130)
Deferred tax liabilities | (319,154) | (321,938)
Net deferred tax liability | $ (200,583) | $ (211,772)

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