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Document and Entity Information
 12 Months Ended
Dec. 31, 2018
shares
Document and Entity Information [Abstract]  
Entity Registrant Name North American Construction Group Ltd.
Entity Central Index Key 0001368519
Document Type 40-F
Document Period End Date Dec. 31, 2018
Amendment Flag false
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Current Fiscal Year End Date --12-31
Entity Common Stock, Shares Outstanding 27,088,816
Entity Emerging Growth Company false
Entity Current Reporting Status Yes