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Long-Term Debt - Additional Information (Detail)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 27, 2018
CAD ($)
Tranches
Jun. 30, 2018
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2018
USD ($)
Jun. 26, 2018
CAD ($)
May 06, 2018
CAD ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about borrowings [line items]                
Number of tranches | Tranches 2              
Additional revolving credit facilities amount $ 400,000,000         $ 200,000,000    
Gain on modification of revolving credit facilities   $ 1,400,000            
Credit facility average interest rate     4.53% 3.20%        
Letter of credit issued     $ 48,000,000 $ 51,800,000        
Letter of credit outstanding     48,000,000 51,800,000        
Letter of credit issued and outstanding in addition     $ 23,800,000 4,300,000        
Canadian prime rate and US base rate [member]                
Disclosure of detailed information about borrowings [line items]                
Borrowing, interest rate basis     CAD: prime rate loan or a banker's acceptance, USD: US base rate or LIBOR advance, Sterling or Euro: LIBRO advance          
US funds [member]                
Disclosure of detailed information about borrowings [line items]                
Revolving credit facility payable     $ 13,600,000 106,900,000 $ 10.0     $ 85.0
Bonds issued under surety facilities     791,400,000 587,100,000 $ 580.2     $ 467.0
Foreign currencies [member]                
Disclosure of detailed information about borrowings [line items]                
Bonds issued under surety facilities     4,700,000 1,000,000        
Canadian funds [member]                
Disclosure of detailed information about borrowings [line items]                
Revolving credit facility payable     515,000,000 103,000,000        
Bonds issued under surety facilities     3,500,000 200,000        
Expire before two thousand twenty [member]                
Disclosure of detailed information about borrowings [line items]                
Letter of credit issued and outstanding in addition     14,700,000 4,300,000        
Expire after two thousand twenty [member]                
Disclosure of detailed information about borrowings [line items]                
Letter of credit issued and outstanding in addition     9,100,000 0        
Revolving credit facilities [member]                
Disclosure of detailed information about borrowings [line items]                
Revolving credit facilities amount $ 800,000,000   800,000,000          
Revolving credit facilities maturity term 5 years              
Agreement expiry date Jun. 27, 2023              
Unused capacity amount     $ 223,400,000 $ 538,300,000        
Notes payable [member]                
Disclosure of detailed information about borrowings [line items]                
Weighted average rate of interest     3.16% 3.46% 3.16%     3.46%
Aggregate maturity value of notes     $ 78,200,000 $ 61,900,000        
Notes payable [member] | US funds [member]                
Disclosure of detailed information about borrowings [line items]                
Carrying amount of notes payable     23,200,000 $ 57,400,000 $ 17.0     $ 45.7
Notes payable [member] | Foreign currencies [member]                
Disclosure of detailed information about borrowings [line items]                
Carrying amount of notes payable     $ 32,900,000          
Term loan [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]                
Revolving credit facilities maturity term 4 years              
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]                
Revolving credit facilities maturity term 5 years              
Agreement expiry date Jun. 27, 2023              
Drawn borrowing facilities $ 160,000,000              
Tranche A [member]                
Disclosure of detailed information about borrowings [line items]                
Revolving credit facilities amount             $ 150,000,000  
Finance lease obligations [member] | Bottom of range [member]                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate     1.40% 1.40% 1.40%     1.40%
Finance lease obligations [member] | Top of range [member]                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate     5.25% 5.25% 5.25%     5.25%