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Income Taxes - Schedule of Current and Noncurrent Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current deferred tax assets:    
Costs and estimated earnings in excess of billings on uncompleted contracts, net $ 2,384 $ 1,323
Accrued employee benefits 951 1,612
Inventories 2,671 1,393
Trade receivable, net 319 650
Net operating loss carryforwards 500 364
Other 520 693
Total 7,345 6,035
Valuation allowance (500) (146)
Deferred income taxes 6,845 5,889
Current deferred tax liabilities:    
Prepaid expenses (637) (712)
Current deferred tax assets, net 6,208 5,177
Noncurrent deferred tax assets:    
Net operating loss carryforwards 211 549
Tax credit carryforwards 478 64
Accrued employee benefits 3,740 3,673
Other assets 5,520 4,527
Other 138 17
Total 10,087 8,830
Valuation allowance (1,394) (794)
Deferred tax assets, net of valuation allowance noncurrent 8,693 8,036
Noncurrent deferred tax liabilities:    
Property and equipment (19,343) (23,290)
Intangible assets (1,192)  
Noncurrent deferred tax liabilities, net (11,842) (15,254)
Net deferred tax liabilities $ (5,634) $ (10,077)