XML 138 R102.htm IDEA: XBRL DOCUMENT v3.3.1.900

Claims revenue (Details) - CAD CAD in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Contractors [Abstract]
Claims revenue recognized	CAD 7,635	CAD 8,230	CAD 17,053
Claims revenue uncollected (classified as unbilled revenue)	CAD 7,088	CAD 4,622	CAD 8,074

X

- Definition

Revenues, Contract Claims

+ References

No definition available.

+ Details

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Namespace Prefix:	noa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ContractorsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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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

+ Details

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