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Basic and diluted net earnings per share - Schedule of Earnings per Share (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |
Net earnings attributable to shareholders of AQN | $ 782,463 | $ 530,884
Series A and D Preferred shares dividend | 8,401 | 8,486
Net earnings attributable to common shareholders of AQN – basic and diluted | $ 774,062 | $ 522,398
Weighted average number of shares |  |
Basic (in shares) | 559,633,275 | 499,910,876
Effect of dilutive securities (in shares) | 4,740,561 | 4,828,678
Diluted (in shares) | 564,373,836 | 504,739,554
Series A Preferred Stock |  |
Class of Stock [Line Items] |  |
Series A and D Preferred shares dividend | $ 4,611 | $ 4,666
Series D Preferred Stock |  |
Class of Stock [Line Items] |  |
Series A and D Preferred shares dividend | $ 3,790 | $ 3,820

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