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Other information (Details) (CAD) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Cash paid during the year for: |  |
Interest | 10,939 us-gaap_InterestPaid | 25,528 us-gaap_InterestPaid
Income taxes | 0 us-gaap_IncomeTaxesPaid | 91 us-gaap_IncomeTaxesPaid
Cash received during the year for: |  |
Interest | 63 us-gaap_ProceedsFromInterestReceived | 256 us-gaap_ProceedsFromInterestReceived
Income taxes | 88 us-gaap_ProceedsFromIncomeTaxRefunds | 3,797 us-gaap_ProceedsFromIncomeTaxRefunds
Non-cash transactions: |  |
Addition of plant and equipment by means of capital leases | 39,492 us-gaap_CapitalLeaseObligationsIncurred | 13,812 us-gaap_CapitalLeaseObligationsIncurred
Reclass from plant and equipment to assets held for sale | (1,321)noa_AdditionsToAssetsHeldForSale | (5,123)noa_AdditionsToAssetsHeldForSale
Net increase in accounts payable related to purchase of plant and equipment | 0 noa_NoncashorPartNoncashTransactionDecreaseinAccountsPayableIntangibles | 43 noa_NoncashorPartNoncashTransactionDecreaseinAccountsPayableIntangibles
Net decrease in accounts payable related to change in estimated financing fees | (101)noa_NoncashTransactionIncreaseDecreaseinAccountsPayablePurchaseofIntangibles | 0 noa_NoncashTransactionIncreaseDecreaseinAccountsPayablePurchaseofIntangibles
Net increase in accounts payable related to change in the lease inducement payable on the sublease | 107 noa_NoncashTransactionIncreaseDecreaseinAccountsPayableChangetoLeaseInducementPayable | 0 noa_NoncashTransactionIncreaseDecreaseinAccountsPayableChangetoLeaseInducementPayable
Net increase in accrued liabilities related to dividend payable | 697 noa_NoncashTransactionIncreaseDecreaseinAccruedLiabilitiesDividendsPayable | 0 noa_NoncashTransactionIncreaseDecreaseinAccruedLiabilitiesDividendsPayable
Change in non-cash working capital related to piling discontinued operations, excluded from non-cash working capital for continuing operations: |  |
Accounts receivable, net | 3,674 us-gaap_IncreaseDecreaseInAccountsReceivable | 29,765 us-gaap_IncreaseDecreaseInAccountsReceivable
Unbilled revenue | (11,454)us-gaap_IncreaseDecreaseInUnbilledReceivables | 30,275 us-gaap_IncreaseDecreaseInUnbilledReceivables
Inventories | (1,542)us-gaap_IncreaseDecreaseInInventories | (644)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and deposits | (780)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 634 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable | 9,928 us-gaap_IncreaseDecreaseInAccountsPayable | (31,847)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities | (954)us-gaap_IncreaseDecreaseInAccruedLiabilities | (1,603)us-gaap_IncreaseDecreaseInAccruedLiabilities
Long term portion of liabilities related to equipment leases | 0 noa_IncreaseDecreaseInAccruedRentExpense | (209)noa_IncreaseDecreaseInAccruedRentExpense
Billings in excess of costs incurred and estimated earnings on uncompleted contracts | (6,357)us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings | (872)us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings
Net changes in non-cash working capital | (7,485)us-gaap_IncreaseDecreaseInOperatingCapital | 25,499 us-gaap_IncreaseDecreaseInOperatingCapital
Purchase of property, plant and equipment |  |
Non-cash transactions: |  |
Net increase in accounts payable related to purchase of plant and equipment | 283 us-gaap_NoncashOrPartNoncashAcquisitionPayablesAssumed1 / us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis = noa_AcquisitionOfPropertyPlantAndEquipmentMember | 2,888 us-gaap_NoncashOrPartNoncashAcquisitionPayablesAssumed1 / us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis = noa_AcquisitionOfPropertyPlantAndEquipmentMember
Net decrease in short term portion of equipment lease liabilities included in accrued liabilities related to the purchase of plant and equipment | 0 noa_NoncashOrPartNoncashAcquisitionDecreaseInLongTermDebtOfLeaseCurentPortion / us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis = noa_AcquisitionOfPropertyPlantAndEquipmentMember | (159)noa_NoncashOrPartNoncashAcquisitionDecreaseInLongTermDebtOfLeaseCurentPortion / us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis = noa_AcquisitionOfPropertyPlantAndEquipmentMember
Net increase in long term portion of equipment lease liabilities related to the purchase of plant and equipment | 0 noa_NoncashOrPartNoncashAcquisitionDecreaseInLongTermDebtOfLease / us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis = noa_AcquisitionOfPropertyPlantAndEquipmentMember | 1,702 noa_NoncashOrPartNoncashAcquisitionDecreaseInLongTermDebtOfLease / us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis = noa_AcquisitionOfPropertyPlantAndEquipmentMember
Restricted share units (RSUs) | Restricted share unit plan |  |
Non-cash transactions: |  |
Net change in accrued liabilities related to current portion of plan liabilities | (924)noa_IncreaseDecreaseInAccruedShareBasedCompensationLiabilities / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = noa_RestrictedShareUnitPlanMember | 1,430 noa_IncreaseDecreaseInAccruedShareBasedCompensationLiabilities / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = noa_RestrictedShareUnitPlanMember
Deferred stock units (DSUs) | Directors' deferred share unit plan |  |
Non-cash transactions: |  |
Net change in accrued liabilities related to current portion of plan liabilities | 408 noa_IncreaseDecreaseInAccruedShareBasedCompensationLiabilities / us-gaap_AwardTypeAxis = noa_DeferredStockUnitsMember / us-gaap_PlanNameAxis = noa_DirectorsDeferredShareUnitPlanMember | (253)noa_IncreaseDecreaseInAccruedShareBasedCompensationLiabilities / us-gaap_AwardTypeAxis = noa_DeferredStockUnitsMember / us-gaap_PlanNameAxis = noa_DirectorsDeferredShareUnitPlanMember
Stock options | Senior executive stock option plan |  |
Non-cash transactions: |  |
Net change in accrued liabilities related to current portion of plan liabilities | 22 noa_IncreaseDecreaseInAccruedShareBasedCompensationLiabilities / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = noa_SeniorExecutiveStockOptionPlanMember | 0 noa_IncreaseDecreaseInAccruedShareBasedCompensationLiabilities / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = noa_SeniorExecutiveStockOptionPlanMember
Continuing operations |  |
Non-cash transactions: |  |
Addition of plant and equipment by means of capital leases | 39,492 us-gaap_CapitalLeaseObligationsIncurred / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember | 13,812 us-gaap_CapitalLeaseObligationsIncurred / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember

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