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Consolidated Statements of Changes in Shareholders' Equity (CAD) In Thousands, unless otherwise specified	Total	Common shares	Treasury shares	Additional paid-in capital	Deficit	Accumulated other comprehensive (loss) income
Beginning balance at Dec. 31, 2012	132,557us-gaap_StockholdersEquity	304,908us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		10,292us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(182,616)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(27)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	69,184us-gaap_NetIncomeLoss				69,184us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Unrealized foreign currency translation loss	27us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax					27us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Exercised stock options	1,175us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	1,742us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		(567)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock-based compensation	632us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue			632us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Share purchase program	(11,740)noa_AdjustmentsToAdditionalPaidInCapitalRepurchaseOfSharesToSettleStockAwardPlan	(16,133)noa_AdjustmentsToAdditionalPaidInCapitalRepurchaseOfSharesToSettleStockAwardPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		4,393noa_AdjustmentsToAdditionalPaidInCapitalRepurchaseOfSharesToSettleStockAwardPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Ending balance at Dec. 31, 2013	191,835us-gaap_StockholdersEquity	290,517us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	0us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	14,750us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(113,432)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	0us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,169)us-gaap_NetIncomeLoss				(1,169)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Unrealized foreign currency translation loss	0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Exercised stock options	2,807us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised	4,521us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		(1,714)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stock-based compensation	4,533us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue			4,533us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Dividends	(2,801)us-gaap_DividendsCommonStockCash				(2,801)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Share purchase program	(1,941)noa_AdjustmentsToAdditionalPaidInCapitalRepurchaseOfSharesToSettleStockAwardPlan	(4,238)noa_AdjustmentsToAdditionalPaidInCapitalRepurchaseOfSharesToSettleStockAwardPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		2,297noa_AdjustmentsToAdditionalPaidInCapitalRepurchaseOfSharesToSettleStockAwardPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Purchase of treasury shares for settlement of certain equity classified stock-based compensation	(3,685)us-gaap_TreasuryStockValueAcquiredCostMethod		(3,685)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending balance at Dec. 31, 2014	189,579us-gaap_StockholdersEquity	290,800us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	(3,685)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	19,866us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	(117,402)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	0us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember

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