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Financial instruments and risk management - Maximum credit exposure (Details) (CAD) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Unbilled revenue	43,622us-gaap_UnbilledContractsReceivable	32,168us-gaap_UnbilledContractsReceivable
Maximum exposure to credit risk
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Trade accounts receivables	65,474noa_FairValueConcentrationOfRiskTradeAccountsReceivable / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskMaximumAmountOfLossMember	68,364noa_FairValueConcentrationOfRiskTradeAccountsReceivable / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskMaximumAmountOfLossMember
Other receivables	1,029noa_FairValueConcentrationOfRiskOtherReceivables / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskMaximumAmountOfLossMember	1,813noa_FairValueConcentrationOfRiskOtherReceivables / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskMaximumAmountOfLossMember
Total accounts receivable	66,503us-gaap_FairValueConcentrationOfRiskAccountsReceivable / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskMaximumAmountOfLossMember	70,177us-gaap_FairValueConcentrationOfRiskAccountsReceivable / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskMaximumAmountOfLossMember
Unbilled revenue	43,622us-gaap_UnbilledContractsReceivable / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskMaximumAmountOfLossMember	32,168us-gaap_UnbilledContractsReceivable / us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis = us-gaap_FairValueConcentrationOfRiskMaximumAmountOfLossMember

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- Definition

Fair Value, Concentration of Risk, Other Receivables

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Fair Value, Concentration of Risk, Trade Accounts Receivable

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- Definition

This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Subparagraph a, b

-Article 5

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3(c)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph c(3)

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 912

-SubTopic 310

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6471842&loc=d3e55302-109406

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