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Acquisitions - Heavy construction fleet and related assets (Details)
$ in Thousands
 12 Months Ended
Nov. 23, 2018
CAD ($)
installment
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Schedule of Asset Acquisition [Line Items]      
Payments for asset acquisitions   $ 151,180 $ 0
Acquisition Of Aecon Construction Group Inc.'s Heavy Construction Equipment Fleet And Related Assets      
Schedule of Asset Acquisition [Line Items]      
Payments for asset acquisitions $ 198,000    
Initial payment 150,800    
Capital leases and equipment related promissory notes $ 12,600    
Number of installment payments | installment 3    
Transaction costs $ 400