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Basic and diluted net earnings per share - Schedule of Earnings per Share (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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