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Shares - Dividends (Details) (CAD) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended			12 Months Ended
	Oct. 21, 2014	Jul. 21, 2014	Apr. 21, 2014	Dec. 31, 2014	Feb. 19, 2014
Equity [Abstract]
Annual aggregate dividend (CAD per share)					0.08noa_DividendsPayableAnnualAggregateDividend
Dividends paid (CAD per share)	0.02us-gaap_CommonStockDividendsPerShareCashPaid	0.02us-gaap_CommonStockDividendsPerShareCashPaid	0.02us-gaap_CommonStockDividendsPerShareCashPaid	0.02us-gaap_CommonStockDividendsPerShareCashPaid
Dividends payable				697us-gaap_DividendsPayableCurrentAndNoncurrent

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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph a

-Article 7



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Balance Type:	credit
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- Details

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