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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 |  |  |  |

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