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Related party transactions (Detail) $ in Thousands |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) MW | Dec. 31, 2019 CAD ($) MW | Dec. 31, 2018 USD ($) | Sep. 30, 2019 USD ($)
Transactions with Third Party [Line Items] |  |  |  |  |  |
Interest income |  |  | $ 100,886,000 |  | $ 39,263,000 |
Fair value loss |  |  | 278,084,000 |  | (137,957,000) |
Amounts reclassified from AOCI to the statement of operations |  |  | 7,107,000 |  | 4,343,000 |
Non-controlling interest attributable to subsidiary |  |  | 16,482,000 |  | 2,622,000 |
Distribution from interest in noncontrolling interest |  |  | 26,465,000 | $ 34,373 |  |
Contributions from redeemable non-controlling interests |  |  | 3,403,000 |  | 0 |
Non-controlling interest incurred |  |  | (9,006,000) |  | (7,545,000) |
Redeemable Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  | 1,848,000 |  | 644,000 |
Equity Method Investee |  |  |  |  |  |
Transactions with Third Party [Line Items] |  |  |  |  |  |
Reimbursement of expenses |  |  | 12,374,000 |  | 11,390,000 |
Affiliated Entity |  |  |  |  |  |
Transactions with Third Party [Line Items] |  |  |  |  |  |
Exchange of note receivable | $ 30,293 |  |  |  |  |
Gain (loss) on sale of investments | $ 0 |  |  |  |  |
Non-controlling interest incurred |  |  | 16,482,000 |  | 2,622,000 |
Related Party |  |  |  |  |  |
Transactions with Third Party [Line Items] |  |  |  |  |  |
Amount reclassified from AOCI into earnings before tax |  |  | 15,765,000 |  |  |
Amounts reclassified from AOCI to the statement of operations |  |  | 11,412,000 |  |  |
Contributions from redeemable non-controlling interests |  |  |  |  | $ 305,000,000 |
Related Party | Equity Method Investee |  |  |  |  |  |
Transactions with Third Party [Line Items] |  |  |  |  |  |
Exchange of note receivable |  |  |  |  |  | $ 21,107,000
Redeemable Non-Controlling Interest | Affiliated Entity |  |  |  |  |  |
Transactions with Third Party [Line Items] |  |  |  |  |  |
Distribution from interest in noncontrolling interest |  | $ 0 |  |  |  |
Redeemable Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |  |  | $ 18,241,000 |  |  |
Long Sault Hydro Facility |  |  |  |  |  |
Transactions with Third Party [Line Items] |  |  |  |  |  |
Hydro power capacity (megawatt) | MW |  |  | 18 | 18 |  |

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