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Accumulated other comprehensive income (loss) - Schedule of Accumulated Other Comprehensive Income (loss) (Detail) - 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
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance $ 7,055,820 $ 7,274,807 $ 6,836,439 $ 7,382,079 $ 7,382,079
OCI     68,778   (123,129)
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations     (240)   33,093
OCI, net of tax 35,728 (61,412) 68,538 (112,446) (90,036)
OCI attributable to the non-controlling interests     (212)   1,650
Net current period OCI attributable to shareholders of AQN     68,326   (88,386)
Ending Balance 6,835,466 7,031,067 6,835,466 7,031,067 6,836,439
Total          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance (127,068) (123,398) (160,063) (71,677) (71,677)
OCI, net of tax 35,331 (59,972) 68,326 (111,693)  
Ending Balance (91,737) $ (183,370) (91,737) (183,370) (160,063)
Foreign currency cumulative translation          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     (98,467) (76,615) (76,615)
OCI     16,343   (18,013)
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations     (788)   (5,489)
OCI, net of tax     15,555   (23,502)
OCI attributable to the non-controlling interests     (212)   1,650
Net current period OCI attributable to shareholders of AQN     15,343   (21,852)
Ending Balance (83,124)   (83,124)   (98,467)
Unrealized gain (loss) on cash flow hedges          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     (97,809) (3,514) (3,514)
OCI     52,435   (128,838)
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations     1,851   34,543
OCI, net of tax     54,286   (94,295)
OCI attributable to the non-controlling interests     0   0
Net current period OCI attributable to shareholders of AQN     54,286   (94,295)
Ending Balance (43,523)   (43,523)   (97,809)
Pension and post-employment actuarial changes          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     36,213 $ 8,452 8,452
OCI     0   23,722
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations     (1,303)   4,039
OCI, net of tax     (1,303)   27,761
OCI attributable to the non-controlling interests     0   0
Net current period OCI attributable to shareholders of AQN     (1,303)   27,761
Ending Balance $ 34,910   $ 34,910   $ 36,213