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Other assets - Deferred lease inducements asset (Details) - CAD CAD in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Deferred Lease Inducements Asset [Roll Forward] |  |
Balance, beginning of year | CAD 1,070 | CAD 1,212
Amortization of deferred lease inducements | (143) | (142)
Balance, end of year | CAD 927 | CAD 1,070

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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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- Definition Deferred Lease Inducements Asset [Roll Forward] + References No definition available. + Details
Name: | noa_DeferredLeaseInducementsAssetRollForward
Namespace Prefix: | noa_
Data Type: | xbrli:stringItemType
Balance Type: | na
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 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_LeaseIncentiveReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant