XML 79 R3.htm IDEA: XBRL DOCUMENT v2.4.1.9

Consolidated Balance Sheets (Parenthetical)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Common shares, authorized	unlimited	unlimited

X

- Definition

Common stock share authorized.

+ References

No definition available.

+ Details

Name:	noa_CommonStockShareAuthorized
Namespace Prefix:	noa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementOfFinancialPositionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration