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Accounts receivable (Details) (CAD) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Accounts receivable – trade	54,733us-gaap_AccountsReceivableGrossCurrent	59,309us-gaap_AccountsReceivableGrossCurrent
Accounts receivable – holdbacks	10,741noa_AccountsReceivableHoldbacksGrossCurrent	9,055noa_AccountsReceivableHoldbacksGrossCurrent
Accounts receivable – other	1,029us-gaap_OtherReceivablesGrossCurrent	1,813us-gaap_OtherReceivablesGrossCurrent
Allowance for doubtful accounts (note 15(d))	0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	(185)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Total accounts receivable	66,503us-gaap_AccountsAndOtherReceivablesNetCurrent	70,177us-gaap_AccountsAndOtherReceivablesNetCurrent
Accounts receivable – holdback percentage	10.00%noa_AccountsReceivableMaximumHoldbackPercentage

X

- Definition

Accounts Receivable, Holdbacks, Gross, Current

+ References

No definition available.

+ Details

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X

- Definition

Accounts Receivable, Maximum Holdback Percentage

+ References

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X

- Definition

Amount due from customers, clients, or other third-parties, or arising from transactions not separately disclosed, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

+ References

No definition available.

+ Details

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X

- Definition

Amounts 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.

+ 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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X

- Definition

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

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

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

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- Definition

Amounts of other receivables due within one year of the balance sheet date (or one operating cycle, if longer) from third parties or arising from transactions not separately disclosed.

+ References

No definition available.

+ Details

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