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Basic and diluted net earnings per share - Schedule of Earnings per Share (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Class of Stock [Line Items]        
Net earnings attributable to shareholders of AQN $ 103,222 $ 286,219 $ 117,169 $ 222,422
Series A and D Preferred shares dividend 2,276 2,017 4,490 4,157
Net earnings attributable to common shareholders of AQN – basic and diluted $ 100,946 $ 284,202 $ 112,679 $ 218,265
Weighted average number of shares        
Basic (in shares) 614,013,963 529,440,246 606,876,299 527,634,250
Effect of dilutive securities (in shares) 5,982,644 4,812,876 5,813,565 4,920,714
Diluted (in shares) 619,996,607 534,253,122 612,689,864 532,554,964
Series A Preferred Stock        
Class of Stock [Line Items]        
Series A and D Preferred shares dividend $ 1,249 $ 1,107 $ 2,464 $ 2,282
Series D Preferred Stock        
Class of Stock [Line Items]        
Series A and D Preferred shares dividend $ 1,027 $ 910 $ 2,026 $ 1,875