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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred tax assets |  |
Allowance for doubtful accounts | $ 755 | $ 696
Asset impairment | 782 | 764
Inventory | 2,168 | 2,792
Deferred compensation | 3,977 | 3,660
Other accrued liabilities | 6,429 | 5,772
Hedging | 467 | 700
Net operating loss carryforwards | 12,046 | 310
Other | 3,823 | 3,001
Total deferred tax assets | 30,447 | 17,695
Less valuation allowance on deferred tax assets | (298) | (273)
Net deferred tax assets | 30,149 | 17,422
Deferred tax liabilities |  |
Property, plant and equipment | 77,126 | 30,235
Prepaid and other insurance reserves | 5,182 | 3,855
Investment in unconsolidated affiliate | 239 | 433
Other | 687 | 695
Total deferred tax liabilities | 83,234 | 35,218
Net deferred tax liabilities | (53,085) | (17,796)
Consolidated balance sheet classification: |  |
Net current deferred tax assets | 13,613 | 3,224
Net noncurrent deferred tax liabilities | (66,698) | (21,020)
Net deferred tax liabilities | (53,085) | (17,796)
Net deferred tax liabilities by tax jurisdiction: |  |
Federal | (48,503) | (16,324)
State | (4,582) | (1,472)
Net deferred tax liabilities | $ (53,085) | $ (17,796)

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