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Accounting pronouncements recently adopted - Schedule of Effects of Adopting New Revenue Standard (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Current assets      
Accounts receivable, net (notes 6 and 19(c)) $ 82,399 $ 46,806  
Contract assets 10,673 21,572  
Unbilled revenue 9,807 0  
Total current assets 130,379 88,858  
Other assets (note 10) 10,204 5,599  
Investments in affiliates and joint ventures (note 13(a)) 11,788 0  
Total Assets 689,800 383,644  
Current liabilities      
Contract liabilities 4,032 824  
Billings in excess of costs incurred and estimated earnings on uncompleted contracts 0    
Total current liabilities 148,895 77,585  
Deferred tax liabilities (note 11) 44,787 38,157  
Total Liabilities 539,585 237,720  
Shareholders' Equity      
Deficit (113,917) (127,162)  
Shareholders' equity attributable to common shareholders 149,721 145,924  
Total Liabilities and Equity 689,800 383,644  
Revenue (note 19) 410,061 292,557  
Project costs 152,943 116,346  
Gross profit 69,076 39,647  
Operating income before the undernoted 29,980 13,407  
Share of total comprehensive income (60) 0  
Income before income taxes 21,417 6,468  
Comprehensive income 15,321 5,264  
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net income 15,321 5,264  
Deferred income tax expense (note 11) 6,096 1,204  
Net changes in non-cash working capital (note 23(b)) 14,178 (7,029)  
Total operating activities 109,371 49,745  
Increase (decrease) in cash 11,322 $ (5,480)  
Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Adoption of accounting standards (note 3(a))     $ (45)
Adjustments | Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Adoption of accounting standards (note 3(a))     $ (45)
Current assets      
Accounts receivable, net (notes 6 and 19(c)) (9,809)    
Contract assets (10,673)    
Unbilled revenue 22,421    
Total current assets 1,939    
Other assets (note 10) (1,636)    
Investments in affiliates and joint ventures (note 13(a)) 168    
Total Assets 471    
Current liabilities      
Contract liabilities (4,032)    
Billings in excess of costs incurred and estimated earnings on uncompleted contracts 4,032    
Total current liabilities 0    
Deferred tax liabilities (note 11) 127    
Total Liabilities 127    
Shareholders' Equity      
Deficit 344    
Shareholders' equity attributable to common shareholders 344    
Total Liabilities and Equity 471    
Revenue (note 19) 1,940    
Project costs 1,637    
Gross profit 303    
Operating income before the undernoted 303    
Share of total comprehensive income (168)    
Income before income taxes 471    
Comprehensive income 344    
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net income 344    
Deferred income tax expense (note 11) 127    
Net changes in non-cash working capital (note 23(b)) (471)    
Total operating activities 0    
Increase (decrease) in cash 0    
Balances without adoption of Topic 606      
Current assets      
Accounts receivable, net (notes 6 and 19(c)) 72,590    
Contract assets 0    
Unbilled revenue 22,421    
Total current assets 132,318    
Other assets (note 10) 8,568    
Investments in affiliates and joint ventures (note 13(a)) 11,956    
Total Assets 690,271    
Current liabilities      
Contract liabilities 0    
Billings in excess of costs incurred and estimated earnings on uncompleted contracts 4,032    
Total current liabilities 148,895    
Deferred tax liabilities (note 11) 44,914    
Total Liabilities 539,712    
Shareholders' Equity      
Deficit (113,573)    
Shareholders' equity attributable to common shareholders 150,065    
Total Liabilities and Equity 690,271    
Revenue (note 19) 412,001    
Project costs 154,580    
Gross profit 69,379    
Operating income before the undernoted 30,283    
Share of total comprehensive income (228)    
Income before income taxes 21,888    
Comprehensive income 15,665    
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net income 15,665    
Deferred income tax expense (note 11) 6,223    
Net changes in non-cash working capital (note 23(b)) 13,707    
Total operating activities 109,371    
Increase (decrease) in cash $ 11,322