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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, 2013
Dec. 31, 2012
Deferred Tax Assets And Liabilities [Line Items]    
Inventories $ 4,398 $ 3,490
State income taxes (331) (431)
Vacation pay accrual 648 354
Accrued bonuses 1,791 2,289
Bad debt 169 192
Prepaid expenses (1,929) (1,490)
Other 1,775 473
Net deferred tax asset 6,521 4,877
Plant and equipment, principally due to differences in depreciation and capitalized interest (25,662) (21,993)
Tax credit 14 73
Fair value adjustment 207 460
Other 2,111 2,297
Net deferred tax liability (23,330) (19,163)
Total net deferred tax liability $ (16,809) $ (14,286)