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Long-term debt - Schedule of Long-term Debt (Detail) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 CLP ($) | Sep. 23, 2020 USD ($) | Dec. 31, 2019 USD ($) | May 23, 2019 USD ($) | Jan. 29, 2019 CAD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt | $ 4,538,470,000 |  |  |  | $ 3,931,868,000 |  |
Less: current portion | (139,874,000) |  |  |  | (225,013,000) |  |
Long-term debt, excluding current portion | $ 4,398,596,000 |  |  |  | 3,706,855,000 |  |
Senior Unsecured Notes | U.S. Dollar Senior Unsecured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average coupon | 3.46% | 3.46% | 3.46% |  |  |  |
Par value | $ 1,700,000,000 |  |  | $ 600,000,000 |  |  |
Long-term debt | $ 1,688,390,000 |  |  |  | 1,219,579,000 |  |
Senior Unsecured Notes | U.S. Dollar Senior Unsecured Utility Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average coupon | 6.34% | 6.34% | 6.34% |  |  |  |
Par value | $ 142,000,000 |  |  |  |  |  |
Long-term debt | $ 157,212,000 |  |  |  | 233,686,000 |  |
Senior Unsecured Notes | U.S Dollar Senior Secured Utility Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average coupon | 4.71% | 4.71% | 4.71% |  |  |  |
Par value | $ 556,229,000 |  |  |  |  |  |
Long-term debt | $ 561,494,000 |  |  |  | 672,337,000 |  |
Senior Unsecured Notes | Canadian Dollar Senior Unsecured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average coupon | 4.28% | 4.28% | 4.28% |  |  |  |
Par value |  | $ 1,150,669,000 |  |  |  |  | $ 300,000,000
Long-term debt | $ 899,710,000 |  |  |  | 728,679,000 |  |
Senior Unsecured Notes | Canadian Dollar Senior Secured Project Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average coupon | 10.21% | 10.21% | 10.21% |  |  |  |
Par value |  | $ 25,882,000 |  |  |  |  |
Long-term debt | $ 20,315,000 |  |  |  | 21,961,000 |  |
Senior Unsecured Notes | Chilean Unidad de Fomento borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average coupon | 4.29% | 4.29% | 4.29% |  |  |  |
Par value |  |  | $ 1,868,000 |  |  |  |
Long-term debt | $ 92,183,000 |  |  |  | 0 |  |
Senior Unsecured Notes | Senior Unsecured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt | $ 3,917,149,000 |  |  |  | 3,310,819,000 |  |
Senior Unsecured Notes | U.S. Dollar Subordinated Unsecured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average coupon | 6.50% | 6.50% | 6.50% |  |  |  |
Par value | $ 637,500,000 |  |  |  | 350,000,000 | $ 350,000,000 |
Long-term debt | 621,321,000 |  |  |  | 621,049,000 |  |
Revolving Credit Facility | Senior Unsecured Notes | Senior Unsecured Revolving Credit Facilities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt | 223,507,000 |  |  |  | 141,577,000 |  |
Revolving Credit Facility | Senior Unsecured Notes | Senior Unsecured Bank Credit Facilities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt | 152,338,000 |  |  |  | 75,000,000 |  |
Revolving Credit Facility | Senior Unsecured Notes | Commercial Paper |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt | $ 122,000,000 |  |  |  | $ 218,000,000 |  |

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