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LONG-TERM DEBT - Summary of Long-Term Debt (Detail) $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | May 30, 2018 USD ($)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total debt - principal | $ 3,271,969,000 | $ 2,258,873,000 |  |
Less unamortized debt issuance costs and debt discount | 20,716,000 | 14,452,000 |  |
Total debt | 3,251,253,000 | 2,244,421,000 |  |
Less current portion | 28,036,000 | 29,813,000 |  |
Long-term debt | 3,223,217,000 | 2,214,608,000 |  |
Bank Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal | 930,407,000 | 795,830,000 |  |
Finance leases |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal | 34,480,000 | 33,288,000 |  |
Bank revolving loans | Bank Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal | 0 | 0 |  |
U.S. term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  |  |  | $ 800,000,000.0
U.S. term loans | Bank Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal | 900,000,000 | 760,000,000 |  |
Canadian term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal |  |  |  | $ 45,500,000
Canadian term loans | Bank Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal | 0 | 4,703,000 | $ 6.1 |
Other foreign bank revolving and term loans | Bank Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal | 30,407,000 | 31,127,000 |  |
Senior Notes | 4¾% Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal | $ 300,000,000 | 300,000,000 |  |
Stated interest rate | 4.75% |  |  |
Senior Notes | 3¼% Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal | $ 795,307,000 | 729,755,000 |  |
Stated interest rate | 3.25% |  |  |
Senior Notes | 4⅛% Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal | $ 600,000,000 | 400,000,000 |  |
Stated interest rate | 4.125% |  |  |
Senior Notes | 2¼% Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt - principal | $ 611,775,000 | $ 0 |  |
Stated interest rate | 2.25% |  |  |

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