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Subsequent events - Summary of updated Firm Commitment to Purchase Asset (Detail) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments |  | $ 2,975,408,000
2021 |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments |  | 560,914,000
2022 |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments |  | 201,544,000
2023 |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments |  | 408,145,000
2024 |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments |  | 439,433,000
2025 |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments |  | 514,549,000
Thereafter |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments |  | $ 850,823,000
Events after reporting period [member] |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments | $ 3,422,974 |
Events after reporting period [member] | 2021 |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments | 49,800 |
Events after reporting period [member] | 2022 |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments | 187,882 |
Events after reporting period [member] | 2023 |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments | 383,231 |
Events after reporting period [member] | 2024 |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments | 421,271 |
Events after reporting period [member] | 2025 |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments | 487,348 |
Events after reporting period [member] | Thereafter |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Contractual capital commitments | $ 1,893,442 |

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