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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, 2014 | Dec. 31, 2013
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Current deferred tax assets: |  |
Costs and estimated earnings in excess of billings on uncompleted contracts, net | $ 2,186 nwpx_DeferredTaxAssetsCostsAndEstimatedEarningsInExcessOfBillingsOnUncompletedContracts | $ 2,384 nwpx_DeferredTaxAssetsCostsAndEstimatedEarningsInExcessOfBillingsOnUncompletedContracts
Accrued employee benefits | 841 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits | 951 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Inventories | 1,937 us-gaap_DeferredTaxAssetsInventory | 2,671 us-gaap_DeferredTaxAssetsInventory
Trade receivable, net | 372 nwpx_DeferredTaxAssetTradeReceivableNet | 319 nwpx_DeferredTaxAssetTradeReceivableNet
Net operating loss carryforwards | 93 nwpx_DeferredTaxAssetNetOperatingLossCarryforwardsCurrent | 500 nwpx_DeferredTaxAssetNetOperatingLossCarryforwardsCurrent
Other | 1,299 us-gaap_DeferredTaxAssetsOther | 520 us-gaap_DeferredTaxAssetsOther
Total | 6,728 us-gaap_DeferredTaxAssetsGrossCurrent | 7,345 us-gaap_DeferredTaxAssetsGrossCurrent
Valuation allowance | (719)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent | (500)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Deferred income taxes | 6,009 us-gaap_DeferredTaxAssetsNetCurrent | 6,845 us-gaap_DeferredTaxAssetsNetCurrent
Current deferred tax liabilities: |  |
Prepaid expenses | (522)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | (637)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Current deferred tax assets, net | 5,487 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 6,208 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Noncurrent deferred tax assets: |  |
Net operating loss carryforwards | 489 nwpx_DeferredTaxAssetsNetOperatingLossCarryforwardNoncurrent | 211 nwpx_DeferredTaxAssetsNetOperatingLossCarryforwardNoncurrent
Tax credit carryforwards | 996 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 478 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Accrued employee benefits | 4,483 nwpx_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefitsNonCurrent | 3,740 nwpx_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefitsNonCurrent
Other assets | 6,067 nwpx_DeferredTaxAssetOtherAssetsNoncurrent | 5,520 nwpx_DeferredTaxAssetOtherAssetsNoncurrent
Other | 142 nwpx_DeferredTaxAssetsOtherNoncurrent | 138 nwpx_DeferredTaxAssetsOtherNoncurrent
Total | 12,177 us-gaap_DeferredTaxAssetsGrossNoncurrent | 10,087 us-gaap_DeferredTaxAssetsGrossNoncurrent
Valuation allowance | (1,139)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent | (1,394)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Deferred tax assets, net of valuation allowance noncurrent | 11,038 us-gaap_DeferredTaxAssetsNetNoncurrent | 8,693 us-gaap_DeferredTaxAssetsNetNoncurrent
Noncurrent deferred tax liabilities: |  |
Property and equipment | (23,903)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (19,343)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangible assets | (1,150)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | (1,192)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Noncurrent deferred tax liabilities, net | (14,015)us-gaap_DeferredTaxLiabilitiesNoncurrent | (11,842)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax liabilities | $ (8,528)us-gaap_DeferredTaxAssetsLiabilitiesNet | $ (5,634)us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition The noncurrent tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References No definition available. + Details
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