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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets |  |
Allowance for doubtful accounts | $ 722 | $ 823
Asset impairment |  | 226
Inventory | 2,331 | 2,447
Deferred compensation | 4,525 | 3,914
Other accrued liabilities | 8,084 | 7,195
Hedging | 54 | 1,218
Net operating loss and tax credit carryforwards | 19,769 | 13,874
Other | 6,429 | 3,700
Total deferred tax assets | 41,914 | 33,397
Less valuation allowance on deferred tax assets | (1,242) | (292)
Net deferred tax assets | 40,672 | 33,105
Deferred tax liabilities |  |
Property, plant and equipment | 82,760 | 92,962
Prepaid and other insurance reserves | 4,904 | 5,452
Investment in unconsolidated affiliate |  | 64
Other | 413 | 551
Total deferred tax liabilities | 88,077 | 99,029
Net deferred tax liabilities | (47,405) | (65,924)
Consolidated balance sheet classification: |  |
Net current deferred tax assets | 4,774 | 17,204
Net noncurrent deferred tax liabilities | (52,179) | (83,128)
Net deferred tax liabilities | (47,405) | (65,924)
Net deferred tax liabilities by tax jurisdiction: |  |
Federal | (43,055) | (60,696)
State | (4,350) | (5,228)
Net deferred tax liabilities | $ (47,405) | $ (65,924)

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