XML 103 R67.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Income taxes Income Taxes - Expiration of Non-Capital Losses for Income Tax Purposes (Details) CAD in Thousands | Dec. 31, 2015 CAD
--- | ---
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | CAD 60,897
Two Thousand Twenty-Six |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 283
Two Thousand Twenty-Seven |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 0
Two Thousand Twenty-Eight |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 0
Two Thousand Twenty-Nine |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 1
Two Thousand Thirty |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 0
Two Thousand Thirty-One |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 570
Two Thousand Thirty-Two |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 29,466
Two Thousand Thirty-Three |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 21,896
Two Thousand Thirty-Four |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | 8,662
Two Thousand Thirty-Five |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | CAD 19

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OperatingLossCarryforwardsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | noa_YearOfExpirationAxis=noa_TwoThousandTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | noa_YearOfExpirationAxis=noa_TwoThousandTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | noa_YearOfExpirationAxis=noa_TwoThousandTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | noa_YearOfExpirationAxis=noa_TwoThousandTwentyNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | noa_YearOfExpirationAxis=noa_TwoThousandThirtyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | noa_YearOfExpirationAxis=noa_TwoThousandThirtyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | noa_YearOfExpirationAxis=noa_TwoThousandThirtyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | noa_YearOfExpirationAxis=noa_TwoThousandThirtyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | noa_YearOfExpirationAxis=noa_TwoThousandThirtyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | noa_YearOfExpirationAxis=noa_TwoThousandThirtyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |