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Long-term investments - Schedule of Long-Term Investments (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Long-term investments carried at fair value | $ 1,097,661 | $ 814,530 | $ 1,097,661
Other long-term investments |  |  |
Equity-method investees | 50,486 | 30,492 | $ 50,486
Notes receivable from equity-method investees | 9,997 | 101,416 |
Other | 2,247 | 3,870 |
Other long-term investments | 62,730 | 135,778 |
Less: current portion | (1,347) | (1,407) |
Other long-term investments | 61,383 | 134,371 |
Atlantica |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Long-term investments carried at fair value | 1,018,837 | 814,530 |
AYES Canada |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Long-term investments carried at fair value | 78,824 | 0 |
Amherst Island Wind Project |  |  |
Other long-term investments |  |  |
Equity-method investees | 0 | 7,655 |
San Antonio Water System |  |  |
Other long-term investments |  |  |
Equity-method investees | 18,231 | 0 |
Red Lily I Wind Facility |  |  |
Other long-term investments |  |  |
Equity-method investees | 17,284 | 15,705 |
AAGES |  |  |
Other long-term investments |  |  |
Equity-method investees | 1,299 | 2,622 |
Other |  |  |
Other long-term investments |  |  |
Equity-method investees | $ 13,672 | $ 4,510 |

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