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Other assets - Deferred lease inducements asset (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deferred Lease Inducements Asset [Roll Forward]
Balance, beginning of year	$ 784	$ 927
Amortization	(143)	(143)
Balance, end of year	$ 641	$ 784

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

Noncurrent portion of receivables 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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