XML 78 R56.htm IDEA: XBRL DOCUMENT
v3.20.4

Long term debt - Credit Facility Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CAD ($) convenant | Dec. 31, 2019 CAD ($) | Oct. 08, 2020 CAD ($) | Nov. 23, 2018 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |
Financing costs | $ 965,000 | $ 2,689,000 |  |
Credit facility | Revolver | Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity of credit facility |  |  | $ 325,000,000.0 | $ 300,000,000.0
Additional borrowing limit |  |  | 25,000,000.0 | 50,000,000.0
Finance lease borrowing limit |  |  | 150,000,000.0 | 150,000,000.0
Other outstanding debt limit |  |  | $ 20,000,000.0 | 20,000,000.0
Financing costs | 965,000 |  |  |
Amount outstanding during period | 900,000 | 900,000 |  |
Unused borrowing availability under the revolving facility | 104,100,000 | 109,100,000 |  |
Unused borrowing availability under finance lease obligations | $ 29,400,000 | $ 53,900,000 |  |
Number of financial covenants | convenant | 2 |  |  |
Senior leverage ratio, step-up | 0.50 |  |  |
Fixed charge ratio | 1.15 |  |  |
Credit facility | Revolver | Minimum | Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Standby fees percentage | 0.40% |  |  |
Credit facility | Revolver | Maximum | Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Standby fees percentage | 0.75% |  |  |
Credit facility | Letter of credit | Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity of credit facility |  |  |  | $ 25,000,000.0
Debt covenant period, tranche two | Credit facility | Revolver | Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Senior leverage ratio | 3.0 |  |  |

X
- Definition Debt Instrument, Covenant Terms, Fixed Charge Ratio + References No definition available. + Details
Name: | noa_DebtInstrumentCovenantTermsFixedChargeRatio
Namespace Prefix: | noa_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Instrument, Number of Debt Covenants + References No definition available. + Details
Name: | noa_DebtInstrumentNumberofDebtCovenants
Namespace Prefix: | noa_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of Credit Facility, Finance Lease, Maximum Borrowing Capacity + References No definition available. + Details
Name: | noa_LineOfCreditFacilityFinanceLeaseMaximumBorrowingCapacity
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of Credit Facility, Finance Lease, Remaining Borrowing Capacity + References No definition available. + Details
Name: | noa_LineOfCreditFacilityFinanceLeaseRemainingBorrowingCapacity
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of Credit Facility, Accordion Feature, Increase Limit + References No definition available. + Details
Name: | noa_LineofCreditFacilityAccordionFeatureIncreaseLimit
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of Credit Facility, Allowable Other Debt Outstanding Limit + References No definition available. + Details
Name: | noa_LineofCreditFacilityAllowableOtherDebtOutstandingLimit
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Ratio Of Indebtedness To Net Capital, Step-Up Multiple For Following Four Quarters + References No definition available. + Details
Name: | noa_RatioOfIndebtednessToNetCapitalStepUpMultipleForFollowingFourQuarters
Namespace Prefix: | noa_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
Name: | us-gaap_PaymentsOfFinancingCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Indebtedness divided by net capital. + References No definition available. + Details
Name: | us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=noa_CreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | noa_DebtCovenantPeriodAxis=noa_DebtCovenantPeriodTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |