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