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Long-term investments - Additional Information (Detail) $ in Thousands |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2019 USD ($) | Apr. 16, 2019 USD ($) MW | Nov. 28, 2018 USD ($) | May 31, 2019 USD ($) | May 31, 2019 CAD ($) | Jun. 30, 2019 shares | Dec. 31, 2019 USD ($) MW wind_project shares | Dec. 31, 2019 CAD ($) MW wind_project shares | Dec. 31, 2018 USD ($) | May 24, 2019 USD ($) | May 24, 2019 CAD ($) | May 01, 2019 USD ($) mi | Apr. 15, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  | $ 83,770,000 |  | $ 29,588,000 |  |  |  |
Amount drawn under credit facility |  |  | $ 305,000,000 |  |  |  |  |  |  |  |  |  |
Non-controlling interest attributable to subsidiary |  |  |  |  |  |  | 16,482,000 |  | 2,622,000 |  |  |  |
Distribution from interest in noncontrolling interest |  |  |  |  |  |  | 26,465,000 | $ 34,373 |  |  |  |  |
Fair value loss |  |  |  |  |  |  | 278,084,000 |  | (137,957,000) |  |  |  |
Investments carried at fair value |  |  |  |  |  |  | 1,294,147,000 |  | 814,530,000 |  |  |  |
Capital contributed to joint venture | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Dividend and interest income from investments |  |  |  |  |  |  | 100,886,000 |  | 39,263,000 |  |  |  |
Noncontrolling interest in partnerships and joint ventures |  |  |  |  |  |  | 83,770,000 |  | 29,588,000 |  |  |  |
Investments in VIEs |  |  |  |  |  |  | $ 59,091,000 |  | 9,581,000 |  |  |  |
Number of wind projects | wind_project |  |  |  |  |  |  | 3 | 3 |  |  |  |  |
Fair value of support provided |  |  |  |  |  |  | $ 9,493,000 |  | 1,682,000 |  |  |  |
Income (loss) from equity method investments |  |  |  |  |  |  | $ 9,108,000 |  | $ 3,082,000 |  |  |  |
Notes receivable, weighted average interest rate (percent) |  |  |  |  |  |  | 7.66% |  | 9.90% |  |  |  |
AWUSA VR Holding LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest |  |  |  |  |  |  |  |  |  |  |  | 20.00% |
Distance of water pipeline | mi |  |  |  |  |  |  |  |  |  |  |  | 140 |
Note payable | 13,293,000 |  |  |  |  |  |  |  |  |  |  |  |
San Antonio Water System |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value loss |  |  |  |  |  |  | $ (6,007,000) |  | $ 0 |  |  |  |
Investments carried at fair value |  |  |  |  |  |  | 27,072,000 |  | 0 |  |  |  |
Additional deferred credits related to investment in San Antonio Water System |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |
Dividend and interest income from investments |  |  |  |  |  |  | $ 6,007,000 |  | 0 |  |  |  |
Atlantica Yield Energy Solutions Canada, Inc |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, treasury shares purchased (shares) | shares |  |  |  |  |  |  | 1,384,402 | 1,384,402 |  |  |  |  |
Payment to acquire equity method investment |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |
Share received pursuant to prepayment (shares) | shares |  |  |  |  |  |  | 2,000,000 | 2,000,000 |  |  |  |  |
Equity method investment, prepayment |  |  |  |  |  |  | $ 53,750,000 |  |  |  |  |  |
Option to exchange shares | shares |  |  |  |  |  | 3,500,000 |  |  |  |  |  |  |
AYES Canada |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest attributable to subsidiary |  |  |  | $ 96,752,000 |  |  | 73,707,000 |  |  |  |  |  |
Dividend income |  |  |  |  |  |  | 25,572 |  |  |  |  |  |
Fair value loss |  |  |  |  |  |  | (6,649,000) |  | 0 |  |  |  |
Investments carried at fair value |  |  |  |  |  |  | 88,494,000 |  | 0 |  |  |  |
Dividend and interest income from investments |  |  |  |  |  |  | $ 25,572,000 |  | $ 0 |  |  |  |
Atlantica |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest |  |  |  |  |  |  | 44.20% |  | 41.50% |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  | $ 952,567,000 |  |  |  |
Holdback amount on credit facility |  |  |  |  |  |  |  |  | 40,000,000 |  |  |  |
Holdback settled in 2019 |  |  |  |  |  |  | $ (29,100,000) |  |  |  |  |  |
Fair value loss |  |  |  |  |  |  | 290,740,000 |  | (137,957,000) |  |  |  |
Investments carried at fair value |  |  |  |  |  |  | 1,178,581,000 |  | 814,530,000 |  |  |  |
Dividend and interest income from investments |  |  |  |  |  |  | $ 69,307,000 |  | $ 39,263,000 |  |  |  |
Atlantica | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest |  |  |  |  |  |  | 48.50% |  |  |  |  |  |
Maverick |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Wind power capacity (megawatt) | MW |  |  |  |  |  |  | 490 | 490 |  |  |  |  |
Sugar Creek |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Wind power capacity (megawatt) | MW |  |  |  |  |  |  | 202 | 202 |  |  |  |  |
75% Interest in Red Lily I Partnership |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest |  |  |  |  |  |  | 75.00% |  |  |  |  |  |
Wind power capacity (megawatt) | MW |  |  |  |  |  |  | 26.4 | 26.4 |  |  |  |  |
Other Development Projects |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Windlectric |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Equity method investments |  |  |  |  |  |  |  |  |  | $ 91,918,000 | $ 123,603 |  |
Non-controlling interest attributable to subsidiary |  |  |  |  | $ 130,103 |  |  |  |  |  |  |  |
Non-controlling interest calculated using the HLBV method |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Wind power capacity (megawatt) | MW |  | 75 |  |  |  |  |  |  |  |  |  |  |
Development loan |  | $ 316,786,000 |  |  |  |  |  |  |  |  |  |  |
Altavista |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Solar power capacity (megawatt ac) | MW |  |  |  |  |  |  | 80 | 80 |  |  |  |  |
Southern Missouri Wind Projects |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Wind power capacity (megawatt) | MW |  |  |  |  |  |  | 150 | 150 |  |  |  |  |
Number of wind projects | wind_project |  |  |  |  |  |  | 2 | 2 |  |  |  |  |
AAGES B.V Secured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Duration of credit facility |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Secured credit facility |  |  | $ 306,500,000 |  |  |  |  |  |  |  |  |  |
Secured Loan | AWUSA VR Holding LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  |  |  |  | $ 17,000,000 |
Atlantica | Windlectric |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  |  |  |  | $ 4,834,000 | $ 6,500 |  |
Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of note receivable | $ 30,293 |  |  |  |  |  |  |  |  |  |  |  |
Windlectric |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  | 6,362,000 |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  | 311,175,000 |  |  |  |  |  |  |  |  |  |  |
Deferred income tax assets, net |  | 3,015,000 |  |  |  |  |  |  |  |  |  |  |
Working capital |  | 14,280,000 |  |  |  |  |  |  |  |  |  |  |
Liabilities |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |

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