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Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred Tax Assets: |  |
Accrued liabilities | $ 550 | $ 593
Allowance for doubtful accounts | 152 | 188
Derivative Contracts | 1,273 | 3
Alternative minimum tax credits | 6,612 | 5,319
Net operating loss carry-forwards | 586 | 575
Percentage depletion carry-forwards | 3,025 | 3,751
Total deferred tax assets | 12,198 | 10,429
Deferred Tax Liabilities: |  |
Basis differences relating to managed partnerships | 6,211 | 6,238
Depletion and depreciation | 43,487 | 41,290
Derivative contracts |  | 250
Total deferred tax liabilities | 49,698 | 47,778
Net non-current deferred income tax liabilities | $ 37,500 | $ 37,349

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