XML 27 R78.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Other long term obligations (Details) (CAD) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Other Liabilities, Noncurrent [Abstract] |  |
Deferred lease inducements | 252 noa_LeaseIncentivePayableNoncurrent | 359 noa_LeaseIncentivePayableNoncurrent
Asset retirement obligation | 562 us-gaap_AssetRetirementObligation | 512 us-gaap_AssetRetirementObligation
Deferred gain on sale leaseback (note 16(d)) | 371 us-gaap_SaleLeasebackTransactionDeferredGainNet | 0 us-gaap_SaleLeasebackTransactionDeferredGainNet
Other obligations, current and noncurrent | 4,991 us-gaap_OtherLiabilities | 9,140 us-gaap_OtherLiabilities
Less current portion of: |  |
Deferred gain on sale leaseback | (93)noa_SaleLeasebackTransactionDeferredGainCurrent | 0 noa_SaleLeasebackTransactionDeferredGainCurrent
Other obligations, noncurrent portion | 3,459 us-gaap_OtherLiabilitiesNoncurrent | 7,207 us-gaap_OtherLiabilitiesNoncurrent
Lease Incentive, Payable [Roll Forward] |  |
Balance, beginning of year | 359 us-gaap_LeaseIncentivePayableCurrentAndNoncurrent | 466 us-gaap_LeaseIncentivePayableCurrentAndNoncurrent
Amortization of deferred lease inducements | (107)us-gaap_AmortizationOfLeaseIncentives | (107)us-gaap_AmortizationOfLeaseIncentives
Balance, end of year | 252 us-gaap_LeaseIncentivePayableCurrentAndNoncurrent | 359 us-gaap_LeaseIncentivePayableCurrentAndNoncurrent
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Balance, beginning of year | 512 us-gaap_AssetRetirementObligation | 466 us-gaap_AssetRetirementObligation
Accretion expense | 50 us-gaap_AssetRetirementObligationAccretionExpense | 46 us-gaap_AssetRetirementObligationAccretionExpense
Balance, end of year | 562 us-gaap_AssetRetirementObligation | 512 us-gaap_AssetRetirementObligation
Estimated undiscounted cash flows required to settle obligation | 1,084 noa_AssetRetirementObligationEstimatedUndiscountedFutureCashFlowToSettle | 1,084 noa_AssetRetirementObligationEstimatedUndiscountedFutureCashFlowToSettle
Credit adjusted risk-free rate assumed in measuring the asset retirement obligation (percent) | 9.42%noa_AssetRetirementObligationRiskFreeRateUsedToMeasure |
Deferred Gain on Sale Leaseback [Roll Forward] |  |
Balance, beginning of year | 0 us-gaap_SaleLeasebackTransactionDeferredGainNet | 0 us-gaap_SaleLeasebackTransactionDeferredGainNet
Addition | 371 noa_SaleLeasebackTransactionDeferredGainAdditions | 0 noa_SaleLeasebackTransactionDeferredGainAdditions
Balance, end of year | 371 us-gaap_SaleLeasebackTransactionDeferredGainNet | 0 us-gaap_SaleLeasebackTransactionDeferredGainNet
Stock options | Senior executive stock option plan |  |
Other Liabilities, Noncurrent [Abstract] |  |
Deferred compensation plans | 22 us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = noa_SeniorExecutiveStockOptionPlanMember | 940 us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = noa_SeniorExecutiveStockOptionPlanMember
Less current portion of: |  |
Deferred compensation plans, current | (22)us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = noa_SeniorExecutiveStockOptionPlanMember | 0 us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = noa_SeniorExecutiveStockOptionPlanMember
Restricted share units (RSUs) | Restricted share unit plan |  |
Other Liabilities, Noncurrent [Abstract] |  |
Deferred compensation plans | 1,779 us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = noa_RestrictedShareUnitPlanMember | 3,667 us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = noa_RestrictedShareUnitPlanMember
Less current portion of: |  |
Deferred compensation plans, current | (1,009)us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = noa_RestrictedShareUnitPlanMember | (1,933)us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_PlanNameAxis = noa_RestrictedShareUnitPlanMember
Deferred stock units (DSUs) | Directors' deferred share unit plan |  |
Other Liabilities, Noncurrent [Abstract] |  |
Deferred compensation plans | 2,005 us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_AwardTypeAxis = noa_DeferredStockUnitsMember / us-gaap_PlanNameAxis = noa_DirectorsDeferredShareUnitPlanMember | 3,662 us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent / us-gaap_AwardTypeAxis = noa_DeferredStockUnitsMember / us-gaap_PlanNameAxis = noa_DirectorsDeferredShareUnitPlanMember
Less current portion of: |  |
Deferred compensation plans, current | (408)us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent / us-gaap_AwardTypeAxis = noa_DeferredStockUnitsMember / us-gaap_PlanNameAxis = noa_DirectorsDeferredShareUnitPlanMember | 0 us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent / us-gaap_AwardTypeAxis = noa_DeferredStockUnitsMember / us-gaap_PlanNameAxis = noa_DirectorsDeferredShareUnitPlanMember

X
- Definition Asset Retirement Obligation, Estimated Undiscounted Future Cash Flow to Settle + References No definition available. + Details
Name: | noa_AssetRetirementObligationEstimatedUndiscountedFutureCashFlowToSettle
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Asset Retirement Obligation, Risk-free Rate Used to Measure + References No definition available. + Details
Name: | noa_AssetRetirementObligationRiskFreeRateUsedToMeasure
Namespace Prefix: | noa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | noa_DeferredGainonSaleLeasebackRollForward
Namespace Prefix: | noa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lease Incentive Payable, Noncurrent + References No definition available. + Details
Name: | noa_LeaseIncentivePayableNoncurrent
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | noa_LeaseIncentivePayableRollForward
Namespace Prefix: | noa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sale Leaseback Transaction, Deferred Gain, Additions + References No definition available. + Details
Name: | noa_SaleLeasebackTransactionDeferredGainAdditions
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sale Leaseback Transaction, Deferred Gain, Current + References No definition available. + Details
Name: | noa_SaleLeasebackTransactionDeferredGainCurrent
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of amortization of lease incentive costs incurred by the lessor for the benefit of the lessee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e40010-112707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e40019-112707 + Details
Name: | us-gaap_AmortizationOfLeaseIncentives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
Name: | us-gaap_AssetRetirementObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationAccretionExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_AssetRetirementObligationRollForwardAnalysisRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This item represents an incentive or inducement contractually stipulated between parties to a lease whereby the lessor has committed to provide the entity (lessee) with a cash payment as inducement to enter the lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
Name: | us-gaap_LeaseIncentivePayableCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_OtherLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_OtherLiabilitiesCurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 + Details
Name: | us-gaap_OtherLiabilitiesNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_OtherLiabilitiesNoncurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of the gain that will be recorded as income or a reduction in rent expense in future periods less amounts recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=21918046&loc=d3e50609-112754 + Details
Name: | us-gaap_SaleLeasebackTransactionDeferredGainNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_AwardTypeAxis=noa_DeferredStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |