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Income taxes (Details) (CAD)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
provincial_jurisdiction
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]    
Loss before income taxes (728)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (24,149)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Tax rate 25.26%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 25.26%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Expected benefit (184)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (6,101)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
(Decrease) increase related to:    
Impact of enacted future statutory income tax rates 0noa_IncomeTaxReconciliationIncomeTaxAdjustmentsAndReassessments (209)noa_IncomeTaxReconciliationIncomeTaxAdjustmentsAndReassessments
Income tax adjustments and reassessments (68)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (249)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Non deductible portion of capital losses (72)noa_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseNondeductiblePortionofCapitalLossesAmount 69noa_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseNondeductiblePortionofCapitalLossesAmount
Stock-based compensation 232us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 315us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Other 61us-gaap_IncomeTaxReconciliationOtherAdjustments 73us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax benefit (31)us-gaap_IncomeTaxExpenseBenefit (6,102)us-gaap_IncomeTaxExpenseBenefit
Current income tax (benefit) expense (92)us-gaap_CurrentIncomeTaxExpenseBenefit (2,438)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax benefit 61us-gaap_DeferredIncomeTaxExpenseBenefit (3,664)us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred tax assets:    
Non-capital losses 31,151us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 39,604us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred financing costs 1,135noa_DeferredTaxAssetsDeferredFinancingCosts 1,709noa_DeferredTaxAssetsDeferredFinancingCosts
Billings in excess of costs on uncompleted contracts 0noa_DeferredTaxAssetsBillingsInExcessOfCosts 1,606noa_DeferredTaxAssetsBillingsInExcessOfCosts
Capital lease obligations 16,148noa_DeferredTaxAssetsCapitalLeaseObligations 10,914noa_DeferredTaxAssetsCapitalLeaseObligations
Deferred lease inducements 64noa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredLeaseIncentives 91noa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredLeaseIncentives
Stock-based compensation 1,666us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,880us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Other 481us-gaap_DeferredTaxAssetsOther 409us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 50,645us-gaap_DeferredTaxAssetsGross 56,213us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Unbilled revenue and uncertified revenue included in accounts receivable 9,538noa_DeferredTaxLiabilitiesUnbilledRevenueAndUncertifiedRevenueIncludedInAccountsReceivable 5,338noa_DeferredTaxLiabilitiesUnbilledRevenueAndUncertifiedRevenueIncludedInAccountsReceivable
Assets held for sale 6,466noa_DeferredTaxLiabilitiesAssetsHeldForSale 13noa_DeferredTaxLiabilitiesAssetsHeldForSale
Accounts receivable – holdbacks 3,084noa_DeferredTaxLiabilitiesAccountsReceivableHoldbacks 2,308noa_DeferredTaxLiabilitiesAccountsReceivableHoldbacks
Property, plant and equipment 58,134us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 56,945us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred partnership income 0us-gaap_DeferredTaxLiabilitiesOther 18,125us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 77,222us-gaap_DeferredIncomeTaxLiabilities 82,729us-gaap_DeferredIncomeTaxLiabilities
Net deferred income tax liability (26,577)us-gaap_DeferredTaxAssetsLiabilitiesNet (26,516)us-gaap_DeferredTaxAssetsLiabilitiesNet
Net deferred tax liability classification    
Current asset 5,609us-gaap_DeferredTaxAssetsNetCurrent 3,678us-gaap_DeferredTaxAssetsNetCurrent
Long term asset 29,947us-gaap_DeferredTaxAssetsNetNoncurrent 27,660us-gaap_DeferredTaxAssetsNetNoncurrent
Current liability (20,056)us-gaap_DeferredTaxLiabilitiesGrossCurrent (8,036)us-gaap_DeferredTaxLiabilitiesGrossCurrent
Long term liability (42,077)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent (49,818)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Net deferred income tax liability (26,577)us-gaap_DeferredTaxAssetsLiabilitiesNet (26,516)us-gaap_DeferredTaxAssetsLiabilitiesNet
Number of provincial jurisdictions 3noa_NumberOfProvincialIncomeTaxingJurisdictions  
Number of Additional Provincial Income Taxing Jurisdictions, Prior to Disposal 2noa_NumberofAdditionalProvincialIncomeTaxingJurisdictionsPriortoDisposal  
Operating loss carryforwards 123,307us-gaap_OperatingLossCarryforwards  
2026    
Net deferred tax liability classification    
Operating loss carryforwards 283us-gaap_OperatingLossCarryforwards
/ noa_YearOfExpirationAxis
= noa_TwoThousandTwentySixMember		  
2027    
Net deferred tax liability classification    
Operating loss carryforwards 0us-gaap_OperatingLossCarryforwards
/ noa_YearOfExpirationAxis
= noa_TwoThousandTwentySevenMember		  
2028    
Net deferred tax liability classification    
Operating loss carryforwards 0us-gaap_OperatingLossCarryforwards
/ noa_YearOfExpirationAxis
= noa_TwoThousandTwentyEightMember		  
2029    
Net deferred tax liability classification    
Operating loss carryforwards 1us-gaap_OperatingLossCarryforwards
/ noa_YearOfExpirationAxis
= noa_TwoThousandTwentyNineMember		  
2030    
Net deferred tax liability classification    
Operating loss carryforwards 5,334us-gaap_OperatingLossCarryforwards
/ noa_YearOfExpirationAxis
= noa_TwoThousandThirtyMember		  
2031    
Net deferred tax liability classification    
Operating loss carryforwards 18,567us-gaap_OperatingLossCarryforwards
/ noa_YearOfExpirationAxis
= noa_TwoThousandThirtyOneMember		  
2032    
Net deferred tax liability classification    
Operating loss carryforwards 48,910us-gaap_OperatingLossCarryforwards
/ noa_YearOfExpirationAxis
= noa_TwoThousandThirtyTwoMember		  
2033    
Net deferred tax liability classification    
Operating loss carryforwards 34,788us-gaap_OperatingLossCarryforwards
/ noa_YearOfExpirationAxis
= noa_TwoThousandThirtyThreeMember		  
2034    
Net deferred tax liability classification    
Operating loss carryforwards 15,424us-gaap_OperatingLossCarryforwards
/ noa_YearOfExpirationAxis
= noa_TwoThousandThirtyFourMember		  
Capital loss carryforward    
Net deferred tax liability classification    
Valuation allowance, amount 962us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_CapitalLossCarryforwardMember		 962us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_CapitalLossCarryforwardMember