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Accumulated other comprehensive income (loss) (Detail) - 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
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance $ 6,434,802 $ 7,055,820 $ 6,624,408 $ 6,836,439 $ 6,836,439
Other comprehensive income (loss)     50,388   61,958
Amounts reclassified from AOCI to the unaudited interim condensed consolidated statements of operations     (12,494)   (3,164)
OCI, net of tax 38,980 35,728 37,894 68,538 58,794
OCI attributable to the non-controlling interests     1,022   (1,017)
Net current period OCI attributable to shareholders of AQN     38,916   57,777
Ending Balance 7,686,504 6,835,466 7,686,504 6,835,466 6,624,408
Total          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance (104,452) (127,068) (102,286) (160,063) (160,063)
OCI, net of tax 41,082 35,331 38,916 68,326  
Ending Balance (63,370) $ (91,737) (63,370) (91,737) (102,286)
Foreign currency cumulative translation          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     (104,870) (98,467) (98,467)
Other comprehensive income (loss)     4,690   (3,788)
Amounts reclassified from AOCI to the unaudited interim condensed consolidated statements of operations     (274)   (1,598)
OCI, net of tax     4,416   (5,386)
OCI attributable to the non-controlling interests     1,022   (1,017)
Net current period OCI attributable to shareholders of AQN     5,438   (6,403)
Ending Balance (99,432)   (99,432)   (104,870)
Unrealized gain (loss) on cash flow hedges          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     (38,322) (97,809) (97,809)
Other comprehensive income (loss)     45,698   57,351
Amounts reclassified from AOCI to the unaudited interim condensed consolidated statements of operations     (7,046)   2,136
OCI, net of tax     38,652   59,487
OCI attributable to the non-controlling interests     0   0
Net current period OCI attributable to shareholders of AQN     38,652   59,487
Ending Balance 330   330   (38,322)
Pension and post-employment actuarial changes          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     40,906 $ 36,213 36,213
Other comprehensive income (loss)     0   8,395
Amounts reclassified from AOCI to the unaudited interim condensed consolidated statements of operations     (5,174)   (3,702)
OCI, net of tax     (5,174)   4,693
OCI attributable to the non-controlling interests     0   0
Net current period OCI attributable to shareholders of AQN     (5,174)   4,693
Ending Balance $ 35,732   $ 35,732   $ 40,906