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Claims revenue (Details) - CAD CAD in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Claims revenue recognized | CAD 1,171 | CAD 7,547
Claims revenue uncollected (classified as unbilled revenue) | 8,259 | 7,547
Accounts receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Claims revenue uncollected (classified as unbilled revenue) | 1,171 | 0
Unbilled revenue |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Claims revenue uncollected (classified as unbilled revenue) | CAD 7,088 | CAD 7,547

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- Definition Revenues, Contract Claims + References No definition available. + Details
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Namespace Prefix: | noa_
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Balance Type: | credit
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
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- Definition Amount of billed or unbilled claims or other similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |