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Long-Term Debt (Detail)
$ in Thousands, CAD in Millions
Jun. 30, 2017
CAD
Jun. 30, 2017
USD ($)
Mar. 24, 2017
CAD
Mar. 24, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]            
Total debt - principal   $ 3,112,076     $ 1,571,192 $ 1,946,012
Less unamortized debt issuance costs   18,314     9,609 10,915
Debt long term and short term less unamortized debt issuance costs combined amount   3,093,762     1,561,583 1,935,097
Less current portion   648,850     217,127 569,892
Long-term debt   2,444,912     1,344,456 1,365,205
Bank debt [Member]            
Debt Instrument [Line Items]            
Total debt - principal   1,489,971     771,192 1,146,012
5% Senior Notes due 2020 [Member]            
Debt Instrument [Line Items]            
Total debt - principal   $ 280,000     $ 500,000 $ 500,000
Senior note interest rate (percent) 5.00% 5.00%     5.00% 5.00%
5 1/2% Senior Notes due 2022 [Member]            
Debt Instrument [Line Items]            
Total debt - principal   $ 300,000     $ 300,000 $ 300,000
Senior note interest rate (percent) 5.50% 5.50%     5.50% 5.50%
4 3/4% Senior Notes due 2025 [Member]            
Debt Instrument [Line Items]            
Total debt - principal   $ 300,000     $ 0 $ 0
Senior note interest rate (percent) 4.75% 4.75%        
3 1/4% Senior Notes due 2025 [Member]            
Debt Instrument [Line Items]            
Total debt - principal   $ 742,105     0 0
Senior note interest rate (percent) 3.25% 3.25%        
Revolving Loan [Member] | Bank debt [Member]            
Debt Instrument [Line Items]            
Total debt - principal   $ 609,593     99,500 416,501
Less current portion   609,600        
U S Term Loans [Member] | Bank debt [Member]            
Debt Instrument [Line Items]            
Total debt - principal   800,000   $ 800,000 310,250 346,750
Canadian Term Loans [Member] | Bank debt [Member]            
Debt Instrument [Line Items]            
Total debt - principal CAD 45.5 35,021 CAD 45.5   44,274 45,833
Euro Term Loans [Member] | Bank debt [Member]            
Debt Instrument [Line Items]            
Total debt - principal   0     196,668 232,262
Other Foreign Bank Revolving And Term Loans [Member] | Bank debt [Member]            
Debt Instrument [Line Items]            
Total debt - principal   45,357     $ 120,500 $ 104,666
Less current portion   $ 39,300