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Long-Term Debt - Summary of Long-Term Debt (Detail) $ in Thousands, $ in Millions | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Feb. 13, 2017 | Sep. 09, 2013 | Mar. 23, 2012 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | $ 2,258,873 |  | $ 2,317,723 |  |  |
Unamortized Debt Issuance Costs |  | 14,452 |  | 13,109 |  |  |
Total debt |  | 2,244,421 |  | 2,304,614 |  |  |
Less current portion |  | 29,813 |  | 170,214 |  |  |
Long-term debt |  | 2,214,608 |  | 2,134,400 |  |  |
Long-term debt, due in the next twelve months |  | 27,877 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in 2021 |  | 3,250 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in 2022 |  | 0 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in 2023 |  | 0 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in 2024 |  | 13,547 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in 2025 and Thereafter |  | 2,180,911 |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | 2,225,585 |  |  |  |  |
Four and One Eighth Percent Senior Notes Due 2028 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | 400,000 |  | 0 |  |  |
Finance Leases [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | 33,288 |  | 21,543 |  |  |
Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | 729,755 |  | 744,380 |  |  |
Bank Borrowings [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | 795,830 |  | 951,800 |  |  |
Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | 300,000 |  | 300,000 |  |  |
Bank revolving loans [Member] | Bank Borrowings [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | 0 |  | 0 |  |  |
U.S. term loans [Member] | Bank Borrowings [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | 760,000 |  | 800,000 |  |  |
Long-term debt |  | 80,000 |  |  |  |  |
Canadian Term Loans [Member] | Bank Borrowings [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases | $ 6.1 | 4,703 | $ 30.1 | 22,103 |  |  |
Other Foreign Bank Revolving And Term Loans [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt, due in the next twelve months |  | 27,900 |  |  |  |  |
Other Foreign Bank Revolving And Term Loans [Member] | Bank Borrowings [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | $ 31,127 |  | 129,697 |  |  |
Senior Notes [Member] | Four and One Eighth Percent Senior Notes Due 2028 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate | 4.125% | 4.125% |  |  |  |  |
Senior Notes [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate | 3.25% | 3.25% |  |  |  |  |
Senior Notes [Member] | Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate | 4.75% | 4.75% |  |  |  |  |
5½% Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | $ 0 |  | 300,000 |  |  |
Stated interest rate |  |  |  |  |  | 5.50% |
5% Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  |  |  |  |  |  | $ 500,000
Stated interest rate |  |  |  |  |  |  | 5.00%
Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 3.25% |  |
Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 4.75% |  |
Term Loan [Member] | Bank Borrowings [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, Long-term and short-term, Combined Amount excluding Finance Leases |  | $ 764,700 |  | $ 822,100 |  |  |

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