XML 47 R67.htm IDEA: XBRL DOCUMENT v2.4.1.9

Other assets - Deferred lease inducements asset (Details) (CAD) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Deferred Lease Inducements Asset [Roll Forward]
Balance, beginning of year	0us-gaap_LeaseIncentiveReceivable	0us-gaap_LeaseIncentiveReceivable
Additions	1,307noa_LeaseIncentiveReceivableAdditions	0noa_LeaseIncentiveReceivableAdditions
Amortization of deferred lease inducements	(95)noa_AmortizationonLeaseIncentiveReceivable	0noa_AmortizationonLeaseIncentiveReceivable
Balance, end of year	1,212us-gaap_LeaseIncentiveReceivable	0us-gaap_LeaseIncentiveReceivable

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

- Details

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

X

- Definition

Lease Incentive Receivable, Additions

+ References

No definition available.

+ Details

Name:	noa_LeaseIncentiveReceivableAdditions
Namespace Prefix:	noa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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 2

-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39927-112707



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 20

-Section 25

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=7501307&loc=d3e89293-111693



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 20

-Section 25

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=7501307&loc=d3e89298-111693

+ Details

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