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v2.4.1.9

Other assets - Deferred lease inducements asset (Details) (CAD) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Deferred Lease Inducements Asset [Roll Forward] |  |
Balance, beginning of year | 0 us-gaap_LeaseIncentiveReceivable | 0 us-gaap_LeaseIncentiveReceivable
Additions | 1,307 noa_LeaseIncentiveReceivableAdditions | 0 noa_LeaseIncentiveReceivableAdditions
Amortization of deferred lease inducements | (95)noa_AmortizationonLeaseIncentiveReceivable | 0 noa_AmortizationonLeaseIncentiveReceivable
Balance, end of year | 1,212 us-gaap_LeaseIncentiveReceivable | 0 us-gaap_LeaseIncentiveReceivable

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- Definition Amortization on Lease Incentive Receivable + References No definition available. + Details
Name: | noa_AmortizationonLeaseIncentiveReceivable
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Lease Incentive Receivable, Additions + References No definition available. + Details
Name: | noa_LeaseIncentiveReceivableAdditions
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This item represents a receivable for 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 840 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39927-112707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 20 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=7501307&loc=d3e89293-111693 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 20 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=7501307&loc=d3e89298-111693 + Details
Name: | us-gaap_LeaseIncentiveReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant