Consolidated Statements of Operations and Comprehensive (loss) Income (CAD) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue	471,777us-gaap_Revenues	470,484us-gaap_Revenues
Project costs	216,342noa_ProjectCost	180,348noa_ProjectCost
Equipment costs	161,108us-gaap_EquipmentExpense	207,906us-gaap_EquipmentExpense
Depreciation	42,927us-gaap_DepreciationAndAmortization	36,491us-gaap_DepreciationAndAmortization
Gross profit	51,400us-gaap_GrossProfit	45,739us-gaap_GrossProfit
General and administrative expenses	33,462us-gaap_GeneralAndAdministrativeExpense	39,901us-gaap_GeneralAndAdministrativeExpense
Loss on disposal of plant and equipment	2,777	3,033
(Gain) loss on disposal of assets held for sale (note 8)	(86)	2,212
Amortization of intangible assets (note 11(b))	3,648us-gaap_AmortizationOfIntangibleAssets	3,276us-gaap_AmortizationOfIntangibleAssets
Operating income (loss) before the undernoted	11,599us-gaap_OperatingIncomeLoss	(2,683)us-gaap_OperatingIncomeLoss
Interest expense (note 21)	12,235us-gaap_InterestExpense	21,697us-gaap_InterestExpense
Foreign exchange loss (gain)	38	(156)
Unrealized gain on derivative financial instruments	0us-gaap_UnrealizedGainLossOnDerivatives	(6,551)us-gaap_UnrealizedGainLossOnDerivatives
Loss on debt extinguishment (note 13(c))	54	6,476
Loss from continuing operations before income taxes	(728)	(24,149)
Income tax (note 9):
Current benefit	(92)us-gaap_CurrentIncomeTaxExpenseBenefit	(2,438)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred expense (benefit)	61us-gaap_DeferredIncomeTaxExpenseBenefit	(3,664)us-gaap_DeferredIncomeTaxExpenseBenefit
Net loss from continuing operations	(697)	(18,047)
(Loss) income from discontinued operations, net of tax (note 22)	(472)	87,231
Net (loss) income	(1,169)us-gaap_NetIncomeLoss	69,184us-gaap_NetIncomeLoss
Other comprehensive income
Unrealized foreign currency translation gain	0	27
Comprehensive (loss) income	(1,169)us-gaap_ComprehensiveIncomeNetOfTax	69,211us-gaap_ComprehensiveIncomeNetOfTax
Per share information from continuing operations
Net loss - basic (note 18) (in CAD per share)	(0.02)	(0.50)
Net loss - diluted (note 18) (in CAD per share)	(0.02)	(0.50)
Net (loss) income - basic (note 18) (in CAD per share)	(0.01)	2.41
Net (loss) income - diluted (note 18) (in CAD per share)	(0.01)	2.39
Net (loss) income - basic (note 18) (in CAD per share)	(0.03)us-gaap_EarningsPerShareBasic	1.91us-gaap_EarningsPerShareBasic
Net (loss) income - diluted (note 18) (in CAD per share)	(0.03)us-gaap_EarningsPerShareDiluted	1.89us-gaap_EarningsPerShareDiluted
Cash dividend per share (note 17(d))	0.08	0

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Project costs.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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