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Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Current Assets: |  |
Accrued liabilities | $ 683 | $ 613
Allowance for doubtful accounts | 118 | 124
Derivative contracts | 677 | (83)
Total current deferred income tax assets | 1,478 | 654
Non-Current Assets: |  |
Alternative minimum tax credits | 5,852 | 5,890
Net operating loss carry-forwards | 168 | 114
Percentage depletion carry-forwards | 4,543 | 4,287
Derivative contracts |  | 91
Total non-current assets | 10,563 | 10,382
Non-Current Liabilities: |  |
Basis differences relating to managed partnerships | 2,462 | 1,492
Depletion and depreciation | 39,694 | 33,084
Derivative contracts | 369 |
Total non-current liabilities | 42,525 | 34,576
Net non-current deferred income tax liabilities | $ 31,962 | $ 24,194

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