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Revenue - Contract costs (Details) - CAD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Capitalized Contract Cost [Line Items] |  |  |
Contract costs |  | $ 2,308,000 | $ 422,000
Reimbursable bid costs |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Contract costs |  | 670,000 | 422,000
Contract costs capitalized during the period |  | 248,000 | 422,000
Fulfillment costs |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Contract costs |  | 1,638,000 | 0
Contract costs capitalized during the period | $ 502,000 | $ 2,611,000 | $ 0

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- Definition Capitalized Contract Cost, Additions + References No definition available. + Details
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Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CapitalizedContractCostLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_CapitalizedContractCostAxis=noa_CapitalizedContractCostFulfillmentCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |