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Other assets - Deferred lease inducements asset (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Deferred Lease Inducements Asset [Roll Forward] |  |
Balance, beginning of year | $ 784 | $ 927
Amortization | (143) | (143)
Balance, end of year | $ 641 | $ 784

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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 Noncurrent portion of receivables 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LeaseIncentiveReceivableNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant