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: