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Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Current Assets: |  |
Accrued liabilities | $ 593 | $ 610
Allowance for doubtful accounts | 188 | 124
Derivative contracts | 3 | 52
Total current assets | 784 | 786
Current Liabilities: |  |
Derivative contracts | 250 | 6,333
Total current liabilities | 250 | 6,333
Net current deferred income tax assets | (534) |
Net current deferred income tax liabilities (assets) |  | 5,547
Non-Current Assets: |  |
Alternative minimum tax credits | 5,319 | 5,722
Net operating loss carry-forwards | 575 | 620
Percentage depletion carry-forwards | 3,751 | 3,959
Total non-current assets | 9,645 | 10,301
Non-Current Liabilities: |  |
Basis differences relating to managed partnerships | 6,238 | 4,300
Depletion and depreciation | 41,290 | 44,192
Total non-current liabilities | 47,528 | 48,492
Net non-current deferred income tax liabilities | $ 37,883 | $ 38,191

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