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Long-term investments - Additional Information (Detail) € in Thousands, $ in Thousands, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 16, 2019 CAD ($) | Apr. 16, 2019 USD ($) | Dec. 20, 2016 MW | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 CAD ($) km | Jun. 30, 2019 USD ($) km | Jun. 30, 2019 EUR (€) km | May 24, 2019 CAD ($) | May 24, 2019 USD ($) | May 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend income |  |  |  | $ 35,381 | $ 8,532 | $ 51,189 | $ 17,210 |  |  |  |  |  |  |
Interest income |  |  |  | 2,349 | 1,185 | 10,076 | 1,731 |  |  |  |  |  |  |
Equity (loss) income |  |  |  | (2,629) | 75 | (4,735) | 472 |  |  |  |  |  |  |
Notes receivable from equity-method investees |  |  |  |  |  |  |  |  | $ 9,997 |  |  |  |  | $ 101,416
Atlantica Yield |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (loss) income |  |  |  | $ 136,809 | 15,033 | 130,991 | (101,971) |  |  |  |  |  |  |
Additional shares purchased in equity method investment (in shares) | shares |  |  |  | 3,384,402 |  |  |  |  |  |  |  |  |  |
Ownership percentage, equity method investment |  |  |  |  |  |  |  | 44.20% | 44.20% | 44.20% |  |  |  | 41.50%
Shares purchased for cash consideration (in shares) | shares |  |  |  | 1,384,402 |  |  |  |  |  |  |  |  |  |
Purchase price for additional shares in equity method investment |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |  |
Shares received pursuant to prepayment (in shares) | shares |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |
Amount prepaid for ordinary shares of equity method investments |  |  |  |  |  |  |  |  | $ 53,750 |  |  |  |  |
Atlantica Yield Energy Solutions Canada, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend income |  |  |  |  |  | 17,466 |  |  |  |  |  |  |  |
Equity (loss) income |  |  |  |  |  | $ (15,415) |  |  |  |  |  |  |  |
Investment in subsidiary |  |  |  |  |  |  |  |  |  |  | $ 123,603 | $ 91,919 |  |
Option to exchange shares (in shares) | shares |  |  |  |  |  | 3,500,000 |  |  |  |  |  |  |  |
AIP |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in subsidiary |  |  |  |  |  |  |  | $ 130,103 | $ 96,752 |  |  |  |  |
Windlectric |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage, equity method investment |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Business combination, purchase price | $ 8,500 | $ 6,362 |  |  |  |  |  |  |  |  |  |  |  |
Development loan at fair value |  | $ 316,786 |  |  |  |  |  |  |  |  |  |  |  |
AWUSA VR Holding LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage, equity method investment |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |
Investment in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,000 |
Investment in subsidiary, payable at later date |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000 |
Abengoa-Algonquin Global Energy Solution B.V. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity (loss) income |  |  |  | $ (2,789) | $ (239) | $ (3,446) | $ (452) |  |  |  |  |  |  |
Ownership percentage, equity method investment |  |  |  |  |  |  |  | 50.00% | 50.00% | 50.00% |  |  |  |
Capital contributed |  |  |  |  |  |  |  |  | $ 2,262 |  |  |  |  | $ 5,000
Letters of credit |  |  |  |  |  |  |  |  | $ 7,655 |  |  |  |  |
Atlantica Yield | Atlantica Yield Energy Solutions Canada, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in subsidiary |  |  |  |  |  |  |  |  |  |  | $ 6,500 | $ 4,834 |  |
Wataynikaneyap Power Transmission |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage, noncontrolling interest |  |  |  |  |  |  |  | 9.80% | 9.80% | 9.80% |  |  |  |
Distance of transmission line | km |  |  |  |  |  |  |  | 1,800 | 1,800 | 1,800 |  |  |  |
Notes Receivable | Abengoa-Algonquin Global Energy Solution B.V. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable from equity-method investees |  |  |  |  |  |  |  |  | $ 9,997 |  |  |  |  | $ 4,940
Subsidiaries | Windlectric |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Evaluated power capacity | MW |  |  | 74.1 |  |  |  |  |  |  |  |  |  |  |
Maximum | Atlantica Yield |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage, equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.50%
Surety Bond |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 15,932 | € 14,000 |  |  |  |

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