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Revenue - Disaggregation of revenue (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 769,539	$ 654,143
As-invoiced
Disaggregation of Revenue [Line Items]
Revenue	522,415	407,496
Cost-to-cost percent complete
Disaggregation of Revenue [Line Items]
Revenue	198,396	218,044
Point-in-time
Disaggregation of Revenue [Line Items]
Revenue	48,728	28,603
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	523,468	388,998
Unit-price
Disaggregation of Revenue [Line Items]
Revenue	234,047	253,840
Lump-sum
Disaggregation of Revenue [Line Items]
Revenue	12,024	11,305
Operations support services
Disaggregation of Revenue [Line Items]
Revenue	688,734	600,308
Equipment and component sales
Disaggregation of Revenue [Line Items]
Revenue	48,728	28,603
Construction services
Disaggregation of Revenue [Line Items]
Revenue	$ 32,077	$ 25,232

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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