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Other assets - Intangible assets (Details) (CAD) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Cost	17,102us-gaap_FiniteLivedIntangibleAssetsGross	22,713us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization	12,717us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	15,670us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Book Value	4,385us-gaap_FiniteLivedIntangibleAssetsNet	7,043us-gaap_FiniteLivedIntangibleAssetsNet
Internally developed computer software capitalized during the period	990us-gaap_CapitalizedComputerSoftwareAdditions	2,826us-gaap_CapitalizedComputerSoftwareAdditions
Internally development computer software disposed of during period	6,601noa_CapitalizedComputerSoftwareDisposals	0noa_CapitalizedComputerSoftwareDisposals
Amortization of intangible assets	3,648us-gaap_AmortizationOfIntangibleAssets	3,276us-gaap_AmortizationOfIntangibleAssets
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2015	1,815us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016	1,410us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017	781us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018	379us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Net Book Value	4,385us-gaap_FiniteLivedIntangibleAssetsNet	7,043us-gaap_FiniteLivedIntangibleAssetsNet

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- Definition

Capitalized Computer Software, Disposals

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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Additions made to capitalized computer software costs during the period.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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