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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforward | $ 413,672 | $ 478,203
Deferred compensation | 24,704 | 50,808
Equity compensation | 5,269 | 29,528
AMT credits and other credits | 7,264 | 13,644
Asset retirement obligation | 69,398 | 99,000
Cumulative mark-to-market loss | 0 | 73,404
Other | 18,806 | 39,922
Valuation allowances: |  |
Total deferred tax assets | 413,979 | 677,335
Deferred tax liabilities: |  |
Depreciation, depletion and investments | (1,105,494) | (1,619,922)
Cumulative mark-to-market gain | (1,841) | 0
Other | 0 | (756)
Total deferred tax liabilities | (1,107,335) | (1,620,678)
Net deferred tax liability | (693,356) | (943,343)
Federal |  |
Valuation allowances: |  |
Valuation allowances | (31,308) | (48,750)
State, net of federal benefit |  |
Valuation allowances: |  |
Valuation allowances | $ (93,826) | $ (58,424)

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