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Subsequent events - Summary of updated Firm Commitment to Purchase Asset (Detail) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
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