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Other assets - Deferred lease inducements asset (Details) - CAD CAD in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Deferred Lease Inducements Asset [Roll Forward]
Balance, beginning of year	CAD 927	CAD 1,070
Amortization of deferred lease inducements	(143)	(143)
Balance, end of year	CAD 784	CAD 927

X

- Definition

Amortization on Lease Incentive Receivable

+ References

No definition available.

+ Details

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

X

- Definition

Deferred Lease Inducements Asset [Roll Forward]

+ References

No definition available.

+ Details

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

X

- Definition

This item represents a receivable for an incentive or inducement contractually stipulated between parties to a lease whereby the lessor has committed to provide the entity (lessee) with a cash payment as inducement to enter the lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e40010-112707

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e40019-112707

+ Details

Name:	us-gaap_LeaseIncentiveReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant