XML 33 R73.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Long term debt - Series 1 Debentures (Details) (CAD) | 12 Months Ended | 0 Months Ended | 8 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Aug. 28, 2013 Corporate debentures Series 1 Debentures | Aug. 24, 2013 Corporate debentures Series 1 Debentures | Aug. 22, 2013 Corporate debentures Series 1 Debentures | Aug. 20, 2013 Corporate debentures Series 1 Debentures | Apr. 07, 2010 Corporate debentures Series 1 Debentures | Dec. 31, 2013 Corporate debentures Series 1 Debentures On or after April 7, 2014 | Dec. 31, 2013 Corporate debentures Series 1 Debentures On or after April 7, 2015 | Dec. 31, 2013 Corporate debentures Series 1 Debentures On or after April 7, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of long term debt |  |  |  |  |  |  | 225,000,000 |  |  |
Stated interest rate on long term debt |  |  |  |  |  |  | 9.125% |  |  |
Redemption price as a percentage of the principal amount |  |  |  | 104.563% |  |  |  | 103.042% | 101.52% | 100.00%
Accrued interest and unpaid interest paid |  |  | 5,000,000 | 300,000 |  |  |  |  |  |
Redemption premium upon a change of control |  |  |  |  |  |  | 101.00% |  |  |
Redemption amount of Series 1 Debentures |  |  | 141,900,000 | 150,000,000.0 | 8,100,000 |  |  |  |  |
Offer to purchase Series 1 Debentures |  |  |  |  |  | 170,000,000.0 |  |  |  |
Loss on debt extinguishment | 6,476,000 | 0 | 6,500,000 |  |  |  |  |  |  |

X
- Definition Debt Instrument, Redemption Premium Upon Change of Control, Percentage + References No definition available. + Details
Name: | noa_DebtInstrumentRedemptionPremiumUponChangeofControlPercentage
Namespace Prefix: | noa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Extinguishment of Debt, Amount of Purchase Offer + References No definition available. + Details
Name: | noa_ExtinguishmentofDebtAmountOfferedtobePurchased
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Payments of Debt Extinguishment Costs, Accrued and Unpaid Interest + References No definition available. + Details
Name: | noa_PaymentsofDebtExtinguishmentCostsAccruedandUnpaidInterest
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross amount of debt extinguished. + References No definition available. + Details
Name: | us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
Name: | us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration