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Long-term investments - Investments in Significant Partnerships and Joint Ventures (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]    
Total assets $ 17,737,876 $ 16,785,836
Total liabilities 10,390,041 9,084,231
Equity-method investees 396,305 433,850
Investments in Significant Partnerships and Joint Ventures    
Schedule of Equity Method Investments [Line Items]    
Total assets 2,347,076 2,126,934
Total liabilities 1,282,385 945,971
Net assets 1,064,691 1,180,963
Investments in Significant Partnerships and Joint Ventures | APUC    
Schedule of Equity Method Investments [Line Items]    
AQN's ownership interest in the entities 278,664 327,555
Difference between investment carrying amount and underlying equity in net assets 117,641 106,295
Equity-method investees $ 396,305 $ 433,850