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v3.19.3.a.u2

Other long term obligations - Other liabilities and obligations (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Deferred gain on sale-leaseback [Roll Forward] |  |
Balance, beginning of year | $ 8,438 | $ 7,654
Addition | 0 | 2,262
Amortization of deferred gain on sale-leaseback | (1,845) | (1,478)
Balance, end of year | $ 6,593 | $ 8,438

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- Definition Deferred Gain on Sale Leaseback [Roll Forward] + References No definition available. + Details
Name: | noa_DeferredGainonSaleLeasebackRollForward
Namespace Prefix: | noa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- Definition The portion of the deferred gain that was recognized in the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108788860&loc=d3e50609-112754 + Details
Name: | us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108788860&loc=d3e50609-112754 + Details
Name: | us-gaap_SaleLeasebackTransactionDeferredGainNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant