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Recent Accounting Pronouncements and Changes to Accounting Policies - Summary of Impacts of Adopting IFRS 15 in Consolidated Statements of Income and Comprehensive Income (Loss) (Detail) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Net income    
Gross revenue $ 4,283.8 $ 4,028.7
Subconsultant/subcontractor and other direct expenses 928.6 854.9
Total income taxes 55.0 166.5
Net income for the year from continuing operations 171.3 97.0
Net loss from discontinued operation, net of tax (123.9)  
Net income for the year 47.4 97.0
Comprehensive income    
Exchange differences on translation of foreign operations 124.1 (134.1)
Other comprehensive income for the year, net of tax 114.5 (117.8)
Total comprehensive income (loss) for the year, net of tax $ 161.9 $ (20.8)
Earnings per share, basic and diluted    
Continuing operations $ 1.51 $ 0.85
Discontinued operations (1.09)  
Total basic and diluted earnings per share $ 0.42 $ 0.85
Previously stated [member]    
Net income    
Gross revenue $ 4,287.9  
Subconsultant/subcontractor and other direct expenses 937.1  
Total income taxes 53.8  
Net income for the year from continuing operations 168.1  
Net loss from discontinued operation, net of tax (146.9)  
Net income for the year 21.2  
Comprehensive income    
Exchange differences on translation of foreign operations 124.7  
Other comprehensive income for the year, net of tax 115.1  
Total comprehensive income (loss) for the year, net of tax $ 136.3  
Earnings per share, basic and diluted    
Continuing operations $ 1.48  
Discontinued operations (1.29)  
Total basic and diluted earnings per share $ 0.19  
Increase (decrease) due to changes in accounting policy required by IFRSs [member]    
Net income    
Gross revenue $ (4.1)  
Subconsultant/subcontractor and other direct expenses (8.5)  
Total income taxes 1.2  
Net income for the year from continuing operations 3.2  
Net loss from discontinued operation, net of tax 23.0  
Net income for the year 26.2  
Comprehensive income    
Exchange differences on translation of foreign operations (0.6)  
Other comprehensive income for the year, net of tax (0.6)  
Total comprehensive income (loss) for the year, net of tax $ 25.6  
Earnings per share, basic and diluted    
Continuing operations $ 0.03  
Discontinued operations 0.20  
Total basic and diluted earnings per share $ 0.23