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Long-Term Debt - Additional Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Jul. 19, 2019
CAD ($)
Tranches
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
AUD ($)
Dec. 31, 2018
USD ($)
Jun. 26, 2018
CAD ($)
Disclosure of detailed information about borrowings [line items]              
Number of tranches | Tranches 2            
Additional revolving credit facilities amount $ 600,000,000           $ 400,000,000
Credit facility average interest rate   3.77% 4.53%        
Letter of credit outstanding   $ 49,900,000 $ 48,000,000        
Letter of credit issued and outstanding in addition   33,300,000 23,800,000        
US funds [member]              
Disclosure of detailed information about borrowings [line items]              
Revolving credit facility payable     13,600,000     $ 10.0  
Bonds issued under surety facilities   386,200,000 791,400,000 $ 297.3   $ 580.2  
Foreign currencies [member]              
Disclosure of detailed information about borrowings [line items]              
Bonds issued under surety facilities   2,600,000 4,700,000        
Canadian funds [member]              
Disclosure of detailed information about borrowings [line items]              
Revolving credit facility payable   448,000,000 515,000,000        
Bonds issued under surety facilities   3,300,000 3,500,000        
Expire before two thousand twenty one [member]              
Disclosure of detailed information about borrowings [line items]              
Letter of credit issued and outstanding in addition   18,700,000 14,700,000        
Expire after two thousand twenty one [member]              
Disclosure of detailed information about borrowings [line items]              
Letter of credit issued and outstanding in addition   14,600,000 9,100,000        
Revolving credit facilities [member]              
Disclosure of detailed information about borrowings [line items]              
Revolving credit facilities amount   800,000,000          
Agreement expiry date Jun. 27, 2024            
Unused capacity amount   282,600,000 223,400,000        
Notes payable [member]              
Disclosure of detailed information about borrowings [line items]              
Aggregate maturity value of notes   $ 90,700,000 $ 78,200,000        
Notes payable [member] | Weighted average [member]              
Disclosure of detailed information about borrowings [line items]              
Borrowings, interest rate   2.70% 3.16% 2.70% 2.70% 3.16%  
Notes payable [member] | US funds [member]              
Disclosure of detailed information about borrowings [line items]              
Carrying amount of notes payable   $ 4,200,000 $ 23,200,000 $ 3.2   $ 17.0  
Notes payable [member] | Foreign currencies [member]              
Disclosure of detailed information about borrowings [line items]              
Carrying amount of notes payable   23,200,000 32,900,000        
Notes payable [member] | Australian funds [member]              
Disclosure of detailed information about borrowings [line items]              
Carrying amount of notes payable   52,000,000   $ 57.1    
Senior Term Loans [member]              
Disclosure of detailed information about borrowings [line items]              
Revolving credit facilities amount   $ 310,000,000          
Term loan tranche B [member]              
Disclosure of detailed information about borrowings [line items]              
Agreement expiry date Jun. 27, 2022            
Drawn borrowing facilities $ 150,000,000            
Term loan tranche C [member]              
Disclosure of detailed information about borrowings [line items]              
Agreement expiry date Jun. 27, 2023            
Drawn borrowing facilities $ 160,000,000            
Software financing obligations [member] | Bottom of range [member]              
Disclosure of detailed information about borrowings [line items]              
Borrowings, interest rate   1.40%   1.40% 1.40%    
Software financing obligations [member] | Top of range [member]              
Disclosure of detailed information about borrowings [line items]              
Borrowings, interest rate   5.25%   5.25% 5.25%