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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)

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