XML 61 R25.htm IDEA: XBRL DOCUMENT v3.3.1.900

Contingencies	12 Months Ended
	Dec. 31, 2015
Contingencies Disclosure [Abstract]
Contingencies	Contingencies During the normal course of the Company’s operations, various legal and tax matters are pending. In the opinion of management, these matters will not have a material effect on the Company’s consolidated financial position or results of operations.

X

- Definition

Contingencies Disclosure [Abstract]

+ References

No definition available.

+ Details

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

X

- Definition

The entire disclosure for legal proceedings, legal contingencies, litigation, regulatory and environmental matters and other contingencies.

+ References

No definition available.

+ Details

Name:	us-gaap_LegalMattersAndContingenciesTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration