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Financial instruments and risk management - Trade receivables (Details) (CAD) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Not past due	60,543noa_AccountsReceivableCurrent	59,337noa_AccountsReceivableCurrent
Past due 1-30 days	3,658noa_AccountsReceivable1To30DaysPastDue	3,948noa_AccountsReceivable1To30DaysPastDue
Past due 31-60 days	2noa_AccountsReceivable31To60DaysPastDue	1,538noa_AccountsReceivable31To60DaysPastDue
More than 61 days	1,271noa_AccountsReceivableGreaterThan60DaysPastDue	3,541noa_AccountsReceivableGreaterThan60DaysPastDue
Total	65,474us-gaap_AccountsReceivableNetCurrent	68,364us-gaap_AccountsReceivableNetCurrent
Allowance for Doubtful Accounts Receivable [Roll Forward]
Opening balance	0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	185us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Current year allowance	164us-gaap_ProvisionForDoubtfulAccounts	365us-gaap_ProvisionForDoubtfulAccounts
Write-offs	(164)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs	0us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Discontinued operations	0noa_AllowanceforDoubtfulAccountsReceivableDiscontinuedOperations	(550)noa_AllowanceforDoubtfulAccountsReceivableDiscontinuedOperations
Ending balance	0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent

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Accounts Receivable, 1 to 30 Days Past Due

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Accounts Receivable, 31 to 60 Days Past Due

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Accounts Receivable, Current

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Accounts Receivable, Greater than 60 Days Past Due

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Allowance for Doubtful Accounts Receivable, Discontinued Operations

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ 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 210.5-02.3-4)

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



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-Publisher SEC

-Name Regulation S-X (SX)

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-Subparagraph a(1)

-Article 5



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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



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

-Publisher FASB

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Amount of direct write-downs of accounts receivable charged against the allowance.

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

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-Name Accounting Standards Codification

-Topic 310

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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