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Related party transactions (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) MW | Jun. 30, 2019 USD ($)
Long Sault Hydro Facility |  |  |  |
Transactions with Third Party [Line Items] |  |  |  |
Hydro power capacity (megawatt) | MW |  |  | 18 |
Redeemable Non-Controlling Interest |  |  |  |
Transactions with Third Party [Line Items] |  |  |  |
Contributions from redeemable non-controlling interests |  |  |  | $ 305,000
Non-controlling interest incurred | $ 3,393 | $ 7,072 | $ 7,159 | 13,914
Distribution to redeemable non-controlling interest | 3,573 | 3,773 | 6,873 | 10,867
Related Party |  |  |  |
Transactions with Third Party [Line Items] |  |  |  |
Distribution from interest in noncontrolling interest | 4,832 | 18,013 | 9,039 | 18,013
Equity Method Investee |  |  |  |
Transactions with Third Party [Line Items] |  |  |  |
Reimbursement of expenses | $ 5,426 | $ 7,159 | $ 9,418 | $ 12,853

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