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Shares - Dividends (Details) - CAD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Equity [Abstract] |  |
Annual aggregate dividend (in CAD per share) | $ 0.08 |
Quarterly dividends paid (CAD per share) | $ 0.02000 | $ 0.02
Dividends payable | $ 500 | $ 510

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- Definition Common Stock, Quarterly Dividends, Per Share, Cash Paid + References No definition available. + Details
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Namespace Prefix: | noa_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Dividends Payable, Annual Aggregate Dividend + References No definition available. + Details
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Namespace Prefix: | noa_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
Name: | us-gaap_DividendsPayableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration