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Long-term investments - Schedule of Long-Term Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investments carried at fair value | $ 1,294,147 | $ 814,530
Noncontrolling interest in partnerships and joint ventures | 83,770 | 29,588
Other | 1,994 | 4,773
Total other long-term investments | 121,968 | 135,778
Less: current portion | 0 | (1,407)
Other long-term investments | 121,968 | 134,371
Notes Receivable | Development loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Development loans receivable from equity-method investees (e) | 36,204 | 101,417
Atlantica |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investments carried at fair value | 1,178,581 | 814,530
AYES Canada |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investments carried at fair value | 88,494 | 0
San Antonio Water System |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investments carried at fair value | $ 27,072 | $ 0

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