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Long-Term Debt - Summary of Long-Term Debt (Detail)
$ in Thousands, $ in Millions
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Feb. 13, 2017
Dec. 31, 2016
USD ($)
Sep. 09, 2013
Mar. 23, 2012
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount   $ 2,317,723   $ 2,564,270        
Unamortized Debt Issuance Costs   13,109   16,979        
Total debt   2,304,614   2,547,291        
Less current portion   170,214   108,789        
Long-term debt   2,134,400   2,438,502        
Long-term debt, due in the next twelve months   170,214            
Long-term Debt, Maturities, Repayments of Principal in 2020   84,548            
Long-term Debt, Maturities, Repayments of Principal in 2021   83,185            
Long-term Debt, Maturities, Repayments of Principal in 2022   383,257            
Long-term Debt, Maturities, Repayments of Principal in 2023   83,336            
Long-term Debt, Maturities, Repayments of Principal in 2024 and Thereafter   1,513,183            
Other Obligations [Member]                
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount   21,543   0        
Three and One Quarter Percent Senior Notes due 2025 [Member]                
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount   744,380   780,325        
Bank Borrowings [Member]                
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount   951,800   903,945        
Four and Three Quarters Percent Senior Notes due 2025 [Member]                
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount   300,000   300,000        
Bank revolving loans [Member] | Bank Borrowings [Member]                
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount   0   0        
U.S. term loans [Member] | Bank Borrowings [Member]                
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount   800,000   800,000        
Canadian Term Loans [Member] | Bank Borrowings [Member]                
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount $ 30.1 22,103 $ 34.1 27,147        
Other Foreign Bank Revolving And Term Loans [Member]                
Debt Instrument [Line Items]                
Long-term debt, due in the next twelve months   129,100            
Other Foreign Bank Revolving And Term Loans [Member] | Bank Borrowings [Member]                
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount   129,697   76,798        
5% Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount   0   280,000   $ 500,000    
Stated interest rate               5.00%
5½% Senior Notes [Member]                
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount   300,000   300,000        
Stated interest rate             5.50%  
Four and Three Quarters Percent Senior Notes due 2025 [Member]                
Debt Instrument [Line Items]                
Stated interest rate         4.75%      
Three and One Quarter Percent Senior Notes due 2025 [Member]                
Debt Instrument [Line Items]                
Stated interest rate         3.25%      
Term Loan [Member]                
Debt Instrument [Line Items]                
Long-term debt, due in the next twelve months   41,100            
Term Loan [Member] | Bank Borrowings [Member]                
Debt Instrument [Line Items]                
Debt, Long-term and Short-term, Combined Amount   $ 822,100   $ 827,100