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Long-term investments - Schedule of Long-Term Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Investments carried at fair value | $ 1,837,429 | $ 1,294,147
Noncontrolling interest in partnerships and joint ventures | 186,452 | 82,111
Other | 5,219 | 3,653
Long-term investments | 214,583 | 121,968
Notes Receivable | Development loans |  |
Schedule of Equity Method Investments [Line Items] |  |
Development loans receivable from equity-method investees (f) | 22,912 | 36,204
Atlantica |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments carried at fair value | 1,706,900 | 1,178,581
Atlantica share subscription agreement |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments carried at fair value | 20,015 | 0
Atlantica Yield Energy Solutions Canada Inc. |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments carried at fair value | 110,514 | 88,494
San Antonio Water System |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments carried at fair value | $ 0 | $ 27,072

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