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Contingencies Contingencies (Details) - CAD CAD in Thousands	Dec. 31, 2016	Dec. 31, 2013
Contingent receivable on previous sale
Loss Contingencies [Line Items]
Contingent additional proceeds on disposal	CAD 92,500	CAD 92,500

X

- Definition

Disposal Group, Including Discontinued Operation, Contingent Consideration, Maximum Proceeds

+ References

No definition available.

+ Details

Name:	noa_DisposalGroupIncludingDiscontinuedOperationContingentConsiderationMaximumProceeds
Namespace Prefix:	noa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=noa_ContingentGainonSaleofBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: