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