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Claims revenue (Details) - CAD CAD in Thousands	12 Months Ended
	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

X

- Definition

Revenues, Contract Claims

+ References

No definition available.

+ Details

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Namespace Prefix:	noa_
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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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X

- 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

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- Details

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