XML 82 R91.htm IDEA: XBRL DOCUMENT v2.4.1.9
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 10,939us-gaap_InterestPaid 25,528us-gaap_InterestPaid
Income taxes 0us-gaap_IncomeTaxesPaid 91us-gaap_IncomeTaxesPaid
Cash received during the year for:    
Interest 63us-gaap_ProceedsFromInterestReceived 256us-gaap_ProceedsFromInterestReceived
Income taxes 88us-gaap_ProceedsFromIncomeTaxRefunds 3,797us-gaap_ProceedsFromIncomeTaxRefunds
Non-cash transactions:    
Addition of plant and equipment by means of capital leases 39,492us-gaap_CapitalLeaseObligationsIncurred 13,812us-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 0noa_NoncashorPartNoncashTransactionDecreaseinAccountsPayableIntangibles 43noa_NoncashorPartNoncashTransactionDecreaseinAccountsPayableIntangibles
Net decrease in accounts payable related to change in estimated financing fees (101)noa_NoncashTransactionIncreaseDecreaseinAccountsPayablePurchaseofIntangibles 0noa_NoncashTransactionIncreaseDecreaseinAccountsPayablePurchaseofIntangibles
Net increase in accounts payable related to change in the lease inducement payable on the sublease 107noa_NoncashTransactionIncreaseDecreaseinAccountsPayableChangetoLeaseInducementPayable 0noa_NoncashTransactionIncreaseDecreaseinAccountsPayableChangetoLeaseInducementPayable
Net increase in accrued liabilities related to dividend payable 697noa_NoncashTransactionIncreaseDecreaseinAccruedLiabilitiesDividendsPayable 0noa_NoncashTransactionIncreaseDecreaseinAccruedLiabilitiesDividendsPayable
Change in non-cash working capital related to piling discontinued operations, excluded from non-cash working capital for continuing operations:    
Accounts receivable, net 3,674us-gaap_IncreaseDecreaseInAccountsReceivable 29,765us-gaap_IncreaseDecreaseInAccountsReceivable
Unbilled revenue (11,454)us-gaap_IncreaseDecreaseInUnbilledReceivables 30,275us-gaap_IncreaseDecreaseInUnbilledReceivables
Inventories (1,542)us-gaap_IncreaseDecreaseInInventories (644)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and deposits (780)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 634us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable 9,928us-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 0noa_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 25,499us-gaap_IncreaseDecreaseInOperatingCapital
Purchase of property, plant and equipment    
Non-cash transactions:    
Net increase in accounts payable related to purchase of plant and equipment 283us-gaap_NoncashOrPartNoncashAcquisitionPayablesAssumed1
/ us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis
= noa_AcquisitionOfPropertyPlantAndEquipmentMember		 2,888us-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 0noa_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 0noa_NoncashOrPartNoncashAcquisitionDecreaseInLongTermDebtOfLease
/ us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis
= noa_AcquisitionOfPropertyPlantAndEquipmentMember		 1,702noa_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		 1,430noa_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 408noa_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 22noa_IncreaseDecreaseInAccruedShareBasedCompensationLiabilities
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= noa_SeniorExecutiveStockOptionPlanMember		 0noa_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 39,492us-gaap_CapitalLeaseObligationsIncurred
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 13,812us-gaap_CapitalLeaseObligationsIncurred
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember