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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Equity Method Investment, Summarized Financial Information [Abstract]          
Total assets $ 18,866,374   $ 18,866,374   $ 18,373,961
Equity-method investees 352,983   352,983   456,393
Income Statement [Abstract]          
Revenue 598,626 $ 627,871 1,335,726 $ 1,406,498  
Net gain (loss) 159,041 (262,321) 38,736 (12,711)  
Other comprehensive income (loss) attributable to AQN 38,980 $ 35,728 37,894 68,538 58,794
Investments in Significant Partnerships and Joint Ventures          
Equity Method Investment, Summarized Financial Information [Abstract]          
Total assets 2,590,705   2,590,705   3,235,474
Total liabilities 1,395,474   1,395,474   1,962,115
Income Statement [Abstract]          
Revenue     67,675 49,467  
Net gain (loss)     (38,136) 1,836  
Other comprehensive income (loss) attributable to AQN     27,731 (2,807)  
Investments in Significant Partnerships and Joint Ventures | APUC          
Income Statement [Abstract]          
Net gain (loss)     (33,375) (153)  
Other comprehensive income (loss) attributable to AQN     12,182 $ (2,076)  
Investments in Significant Partnerships and Joint Ventures          
Equity Method Investment, Summarized Financial Information [Abstract]          
Net assets 1,195,231   1,195,231   1,273,359
Investments in Significant Partnerships and Joint Ventures | APUC          
Equity Method Investment, Summarized Financial Information [Abstract]          
AQN's ownership interest in the entities 310,885   310,885   388,993
Difference between investment carrying amount and underlying equity in net assets 42,098   42,098   67,400
Equity-method investees $ 352,983   $ 352,983   $ 456,393