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Long-term investments - Investments in Significant Partnerships and Joint Ventures (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Equity Method Investment, Summarized Financial Information [Abstract]          
Total assets $ 17,968,713   $ 17,968,713   $ 17,627,613
AQN's investment carrying amount for the entities 388,516   388,516   381,802
Income Statement [Abstract]          
Revenue 627,871 $ 619,385 1,406,498 $ 1,352,622  
Net income (loss) (262,321) (62,322) (12,711) (9,724)  
Other comprehensive loss 35,728 $ (61,412) 68,538 (112,446) (90,036)
Investments in Significant Partnerships and Joint Ventures          
Equity Method Investment, Summarized Financial Information [Abstract]          
Total assets 2,749,895   2,749,895   2,740,132
Total liabilities 1,522,656   1,522,656   1,507,079
Income Statement [Abstract]          
Revenue     49,467 20,455  
Net income (loss)     1,836 (30,246)  
Other comprehensive loss     (2,807) (125,811)  
Investments in Significant Partnerships and Joint Ventures | APUC          
Income Statement [Abstract]          
Net income (loss)     (153) (7,449)  
Other comprehensive loss     (2,076) $ (67,352)  
Investments in Significant Partnerships and Joint Ventures          
Equity Method Investment, Summarized Financial Information [Abstract]          
Net assets 1,227,239   1,227,239   1,233,053
Investments in Significant Partnerships and Joint Ventures | APUC          
Equity Method Investment, Summarized Financial Information [Abstract]          
AQN's ownership interest in the entities 331,600   331,600   332,663
Difference between investment carrying amount and underlying equity in net assets 56,916   56,916   49,139
AQN's investment carrying amount for the entities $ 388,516   $ 388,516   $ 381,802