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Revenue - Disaggregation of revenue (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 719,067	$ 410,061
Cost-to-cost percent complete
Disaggregation of Revenue [Line Items]
Revenue	252,054	186,741
As-invoiced
Disaggregation of Revenue [Line Items]
Revenue	467,013	223,320
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	343,156	151,796
Unit-price
Disaggregation of Revenue [Line Items]
Revenue	375,911	253,277
Cost-plus
Disaggregation of Revenue [Line Items]
Revenue	0	4,988
Construction services
Disaggregation of Revenue [Line Items]
Revenue	132,310	42,481
Operations support services
Disaggregation of Revenue [Line Items]
Revenue	$ 586,757	$ 367,580

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+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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