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Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred Tax Assets And Liabilities [Line Items] |  |
Inventories | $ 3,490 | $ 2,681
State income taxes | (431) | (413)
Vacation pay accrual | 354 | 289
Accrued bonuses | 2,289 | 1,445
Bad debt | 192 | 78
Prepaid expenses | (1,490) | (1,432)
Other | 473 | 769
Net deferred tax asset | 4,877 | 3,417
Plant and equipment, principally due to differences in depreciation and capitalized interest | (21,993) | (20,653)
NOL carryforward |  | 244
Tax credit | 73 |
Fair value adjustment | 460 | 564
Other | 2,297 | 1,256
Net deferred tax liability | (19,163) | (18,589)
Total net deferred tax liability | $ (14,286) | $ (15,172)

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