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Long term debt (Details) (CAD) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	64,269us-gaap_LongTermDebtNoncurrent	75,000us-gaap_LongTermDebtNoncurrent
Credit Facility
Debt Instrument [Line Items]
Long-term debt	5,536us-gaap_LongTermDebtNoncurrent / us-gaap_LongtermDebtTypeAxis = noa_TermAndRevolvingCreditFacilitiesMember	0us-gaap_LongTermDebtNoncurrent / us-gaap_LongtermDebtTypeAxis = noa_TermAndRevolvingCreditFacilitiesMember
Corporate debentures
Debt Instrument [Line Items]
Long-term debt	58,733us-gaap_LongTermDebtNoncurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_CorporateDebtSecuritiesMember	75,000us-gaap_LongTermDebtNoncurrent / us-gaap_LongtermDebtTypeAxis = us-gaap_CorporateDebtSecuritiesMember

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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

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