XML 134 R115.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Other information - Non-cash (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Non-cash transactions: |  |
Addition of property, plant and equipment by means of capital leases | $ 49,440 | $ 34,730
Property, plant and equipment reclassified to asset held for sale | (53) | (6,869)
Increase in capital lease obligations related to purchase of heavy equipment fleet and related assets | 1,759 | 0
Increase in capital lease obligations related to investment in affiliates and joint ventures | 542 | 0
Increase in capital lease obligations related to the initial investment in the partnership | 0 | 800
Increase in equipment promissory notes related to purchase of heavy equipment fleet and related assets | 10,851 | 0
Acquisition of property, plant and equipment related to the initial investment in the partnership | 0 | 2,581
Increase in long term debt related to investment in affiliates and joint ventures | 0 | 637
Increase in long term debt related to investment in affiliates and joint ventures | 3,127 | 0
Non-cash working capital exclusions: |  |
Decrease in contract assets related to adoption of accounting standards | (547) | 0
Increase in inventory related to the initial partnership investment | 0 | 29
Increase in inventory related to the purchase of heavy equipment fleet and related assets | 4,268 | 0
Increase in prepaid expenses related to the initial investment in the partnership | 0 | 4
Increase in other assets related to adoption of accounting standards | 502 | 0
Increase in accrued liabilities related to the current portion of the deferred gain on sale-leaseback | 0 | (859)
Decrease in accrued liabilities related to conversion of bonus compensation to deferred stock units | 326 | 0
Decrease in accrued liabilities related to dividend payable | 10 | 59
Increase in accounts receivable | 13,234 | 0
Increase in contract assets | 3,089 | 0
Increase in inventory | 3,926 | 0
Increase in prepaid expenses | 399 | 0
Increase in accounts payable | (10,604) | 0
Increase in accrued liabilities | (1,136) | 0
Increase in contract liabilities | (360) | 0
Operating activities: |  |
Accounts receivable | (22,359) | (7,148)
Contract assets | 13,441 | (5,607)
Inventories | (443) | (1,288)
Contract costs | (1,384) | 0
Prepaid expenses and deposits | (1,513) | (283)
Accounts payable | 17,665 | 5,640
Accrued liabilities | 5,923 | 1,904
Contract liabilities | 2,848 | (247)
Net changes in non-cash working capital | $ 14,178 | $ (7,029)

X
- Definition Additions to Assets Held for Sale + References No definition available. + Details
Name: | noa_AdditionsToAssetsHeldForSale
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cash Flow, Non-cash Transactions [Abstract] + References No definition available. + Details
Name: | noa_CashFlowNonCashTransactionsAbstract
Namespace Prefix: | noa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Decrease In Accounts Payable, Investment In Affiliates And Joint Ventures + References No definition available. + Details
Name: | noa_DecreaseInAccountsPayableInvestmentInAffiliatesAndJointVentures
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Decrease In Accrued Liabilities Due To Conversion Of Bonus Compensation + References No definition available. + Details
Name: | noa_DecreaseInAccruedLiabilitiesDueToConversionOfBonusCompensation
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Decrease In Contract With Customer, Asset, Due To Adoption Of Accounting Pronouncement + References No definition available. + Details
Name: | noa_DecreaseInContractWithCustomerAssetDueToAdoptionOfAccountingPronouncement
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Decrease In Contract With Customer, Liability, Investment In Affiliates And Joint Ventures + References No definition available. + Details
Name: | noa_DecreaseInContractWithCustomerLiabilityInvestmentInAffiliatesAndJointVentures
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase (Decrease) In Capitalized Contract Costs + References No definition available. + Details
Name: | noa_IncreaseDecreaseInCapitalizedContractCosts
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase In Accounts Receivable, Investment In Affiliates And Joint Ventures + References No definition available. + Details
Name: | noa_IncreaseInAccountsReceivableInvestmentInAffiliatesAndJointVentures
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase In Accrued Liabilities, Investment In Affiliates And Joint Ventures + References No definition available. + Details
Name: | noa_IncreaseInAccruedLiabilitiesInvestmentInAffiliatesAndJointVentures
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase In Contract With Customer, Asset, Investment In Affiliates And Joint Ventures + References No definition available. + Details
Name: | noa_IncreaseInContractWithCustomerAssetInvestmentInAffiliatesAndJointVentures
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase In Inventories Due To Asset Acquisitions + References No definition available. + Details
Name: | noa_IncreaseInInventoriesDueToAssetAcquisitions
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase In Inventories, Investment In Affiliates And Joint Ventures + References No definition available. + Details
Name: | noa_IncreaseInInventoriesInvestmentInAffiliatesAndJointVentures
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase In Other Assets Noncurrent Due To Adoption Of Accounting Pronouncement + References No definition available. + Details
Name: | noa_IncreaseInOtherAssetsNoncurrentDueToAdoptionOfAccountingPronouncement
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase In Prepaid, Deferred Expense And Other Assets, Investment In Affiliates And Joint Ventures + References No definition available. + Details
Name: | noa_IncreaseInPrepaidDeferredExpenseAndOtherAssetsInvestmentInAffiliatesAndJointVentures
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Noncash Or Part Noncash Asset Acquisition, Capital Lease Obligations, Addition Of Property, Plant And Equipment + References No definition available. + Details
Name: | noa_NoncashOrPartNoncashAssetAcquisitionCapitalLeaseObligationsAdditionOfPropertyPlantAndEquipment
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Noncash Or Part Noncash Asset Acquisition, Capital Lease Obligations, Investment In Affiliates And Joint Ventures + References No definition available. + Details
Name: | noa_NoncashOrPartNoncashAssetAcquisitionCapitalLeaseObligationsInvestmentInAffiliatesAndJointVentures
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Noncash Or Part Noncash Asset Acquisition, Capital Lease Obligations, Purchase Of Equipment + References No definition available. + Details
Name: | noa_NoncashOrPartNoncashAssetAcquisitionCapitalLeaseObligationsPurchaseOfEquipment
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Noncash Or Part Noncash Asset Acquisition, Debt Assumed + References No definition available. + Details
Name: | noa_NoncashOrPartNoncashAssetAcquisitionDebtAssumed
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Noncash Transaction, Increase (Decrease) in Accrued Liabilities, Dividends Payable + References No definition available. + Details
Name: | noa_NoncashTransactionIncreaseDecreaseinAccruedLiabilitiesDividendsPayable
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Noncash Transaction, Increase (Decrease) in Accrued Liabilities, Sale Leaseback, Current + References No definition available. + Details
Name: | noa_NoncashTransactionIncreaseDecreaseinAccruedLiabilitiesSaleLeasebackCurrent
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Noncash or Part Noncash Acquisition, Capital Lease Obligations, Investment In Partnership + References No definition available. + Details
Name: | noa_NoncashorPartNoncashAcquisitionCapitalLeaseObligationsInvestmentInPartnership
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Noncash or Part Noncash Acquisition, Debt Assumed, Equipment Purchase + References No definition available. + Details
Name: | noa_NoncashorPartNoncashAcquisitionDebtAssumedEquipmentPurchase
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Noncash or Part Noncash Acquisition Prepaid Expense + References No definition available. + Details
Name: | noa_NoncashorPartNoncashAcquisitionPrepaidExpense
Namespace Prefix: | noa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInAccountsPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInAccruedLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInContractWithCustomerAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInInventories
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period of all assets and liabilities used in operating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInOperatingCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncreaseDecreaseInOperatingCapitalAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in prepaid expenses, and assets classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
Name: | us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
Name: | us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of inventory that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
Name: | us-gaap_NoncashOrPartNoncashAcquisitionInventoryAcquired1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration