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Acquisitions - Heavy construction fleet and related assets (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 23, 2018 CAD ($) installment | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
Schedule of Asset Acquisition [Line Items] |  |  |
Payments for asset acquisitions |  | $ 0 | $ 151,180
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 |  |

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