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Consolidated Statements of Cash Flows (CAD)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Operating activities:    
Net loss from continuing operations (697)us-gaap_IncomeLossFromContinuingOperations (18,047)us-gaap_IncomeLossFromContinuingOperations
Adjustments to reconcile to net cash from operating activities:    
Depreciation 42,927us-gaap_DepreciationAndAmortization 36,491us-gaap_DepreciationAndAmortization
Amortization of intangible assets (note 11(b)) 3,648us-gaap_AmortizationOfIntangibleAssets 3,276us-gaap_AmortizationOfIntangibleAssets
Amortization of deferred financing costs (note 11(c)) 1,594us-gaap_AmortizationOfFinancingCosts 4,326us-gaap_AmortizationOfFinancingCosts
Lease inducement paid on sublease (1,200)noa_PaymentsofLeaseInducements 0noa_PaymentsofLeaseInducements
Loss on disposal of plant and equipment 2,777us-gaap_GainLossOnSaleOfPropertyPlantEquipment 3,033us-gaap_GainLossOnSaleOfPropertyPlantEquipment
(Gain) loss on disposal of assets held for sale (note 8) (86)noa_GainLossOnDispositionOfAssetsHeldForSale 2,212noa_GainLossOnDispositionOfAssetsHeldForSale
Unrealized gain on derivative financial instruments 0us-gaap_UnrealizedGainLossOnDerivatives (6,551)us-gaap_UnrealizedGainLossOnDerivatives
Loss on debt extinguishment (note 13(c)) 54us-gaap_GainsLossesOnExtinguishmentOfDebt 6,476us-gaap_GainsLossesOnExtinguishmentOfDebt
Stock-based compensation expense (note 23(a)) 3,305us-gaap_ShareBasedCompensation 6,193us-gaap_ShareBasedCompensation
Cash settlement of stock-based compensation (note 23(d(i)) and 23(f(i))) (3,235)noa_CashSettlementOfRestrictedShareUnitPlan (1,695)noa_CashSettlementOfRestrictedShareUnitPlan
Other adjustments to cash from operating activities (note 11(d), 16(b) and 16(c)) 38noa_PaymentstoSettleSharebasedPaymentAward (61)noa_PaymentstoSettleSharebasedPaymentAward
Deferred income tax (benefit) (note 9) 61us-gaap_DeferredIncomeTaxExpenseBenefit (3,664)us-gaap_DeferredIncomeTaxExpenseBenefit
Net changes in non-cash working capital (note 24(b)) (7,485)us-gaap_IncreaseDecreaseInOperatingCapital 25,499us-gaap_IncreaseDecreaseInOperatingCapital
Total operating activities 41,701us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 57,488us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities:    
Purchase of plant and equipment (35,146)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (31,351)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Additions to intangible assets (note 11(b)) (990)us-gaap_PaymentsToAcquireIntangibleAssets (2,826)us-gaap_PaymentsToAcquireIntangibleAssets
Proceeds on disposal of plant and equipment 15,378us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 3,978us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Proceeds on disposal of assets held for sale 1,270noa_ProceedsFromDisposalOfPropertyHeldForSale 3,106noa_ProceedsFromDisposalOfPropertyHeldForSale
Total investing activities (19,488)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (27,093)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities:    
Repayment of credit facilities (85,000)us-gaap_RepaymentsOfLongTermLinesOfCredit (234,684)us-gaap_RepaymentsOfLongTermLinesOfCredit
Increase in credit facilities 90,536us-gaap_ProceedsFromLongTermLinesOfCredit 172,396us-gaap_ProceedsFromLongTermLinesOfCredit
Financing costs (note 11(c)) (87)us-gaap_PaymentsOfFinancingCosts (2,789)us-gaap_PaymentsOfFinancingCosts
Redemption of Series 1 Debentures (note 13(c)) (16,321)us-gaap_RepaymentsOfSeniorDebt (156,476)us-gaap_RepaymentsOfSeniorDebt
Proceeds from options exercised (note 23(b) and 23(c)) 2,807us-gaap_ProceedsFromStockOptionsExercised 1,175us-gaap_ProceedsFromStockOptionsExercised
Dividend payments (note 17(d)) (2,104)us-gaap_PaymentsOfDividends 0us-gaap_PaymentsOfDividends
Purchase of treasury shares for share unit settlement (note 17(a)) (3,685)noa_PaymentsforRepurchaseofCommonStockUnitSettlement 0noa_PaymentsforRepurchaseofCommonStockUnitSettlement
Share purchase program (note 17(c)) (1,941)us-gaap_PaymentsForRepurchaseOfCommonStock (11,740)us-gaap_PaymentsForRepurchaseOfCommonStock
Repayment of capital lease obligations (18,732)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (14,030)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Total financing activities (34,527)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (246,148)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Decrease in cash from continuing operations (12,314)us-gaap_NetCashProvidedByUsedInContinuingOperations (215,753)us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash provided by (used in) discontinued operations (note 22)    
Operating activities (472)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations 45,739us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Investing activities 0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations 182,836us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Financing activities 0us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations (271)us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations
Total cash provided by (used in) discontinued operations (472)us-gaap_NetCashProvidedByUsedInDiscontinuedOperations 228,304us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
(Decrease) increase in cash (12,786)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect 12,551us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect
Effect of exchange rate on changes in cash 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 27us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Cash, beginning of year 13,742us-gaap_CashAndCashEquivalentsAtCarryingValue 1,164us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash, end of year 956us-gaap_CashAndCashEquivalentsAtCarryingValue 13,742us-gaap_CashAndCashEquivalentsAtCarryingValue