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Shares - Dividends (Details) - CAD / shares | Dec. 11, 2015 | Oct. 23, 2015 | Jul. 24, 2015 | Apr. 24, 2015 | Jan. 23, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 19, 2014 | Dec. 31, 2013
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Equity [Abstract] |  |  |  |  |  |  |  |  |
Annual aggregate dividend (in CAD per share) |  |  |  |  |  | CAD 0.08 | CAD 0.08 | CAD 0.08 | CAD 0.00
Dividends paid (CAD per share) | CAD 0.02 | CAD 0.02 | CAD 0.02 | CAD 0.02 | CAD 0.02 |  |  |  |

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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 Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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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