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Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Assets: |  |
Accrued liabilities | $ 349 | $ 550
Allowance for doubtful accounts | 22 | 152
Derivative Contracts | 684 | 1,273
Alternative minimum tax credits | 9,919 | 6,612
Net operating loss carry-forwards | 528 | 586
Percentage depletion carry-forwards | 727 | 3,025
Total deferred tax assets | 12,229 | 12,198
Deferred Tax Liabilities: |  |
Basis differences relating to managed partnerships | 3,193 | 6,211
Depletion and depreciation | 33,998 | 43,487
Total deferred tax liabilities | 37,191 | 49,698
Net deferred tax liabilities | $ 24,962 | $ 37,500

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