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Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred Tax Assets: |  |
Accrued liabilities | $ 519 | $ 349
Allowance for doubtful accounts | 51 | 22
Derivative Contracts | 0 | 684
Disallowed Interest Carryforwards | 769 | 0
Alternative minimum tax credits | 4,760 | 9,919
State Net operating loss carry-forwards | 469 | 528
Percentage depletion carry-forwards |  | 727
General Business Credits | 137 |
Total deferred tax assets | 6,705 | 12,229
Deferred Tax Liabilities: |  |
Basis differences relating to managed partnerships | 2,296 | 3,193
Depletion and depreciation | 36,711 | 33,998
Derivative Contracts | 526 |
Total deferred tax liabilities | 39,533 | 37,191
Net deferred tax liabilities | $ 32,828 | $ 24,962

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