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Shares - Dividends (Details) - CAD CAD / shares in Units, CAD in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Annual aggregate dividend (in CAD per share)	CAD 0.08
Quarterly dividends paid (CAD per share)	0.02000	CAD 0.02
Dividends paid (in CAD per share)	CAD 0.08	CAD 0.08
Dividends payable	CAD 510	CAD 569

X

- Definition

Common Stock, Quarterly Dividends, Per Share, Cash Paid

+ References

No definition available.

+ Details

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Namespace Prefix:	noa_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Dividends Payable, Annual Aggregate Dividend

+ References

No definition available.

+ Details

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Namespace Prefix:	noa_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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X

- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

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