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Accumulated other comprehensive income (loss) - Schedule of Accumulated Other Comprehensive Income (loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance $ 6,836,439 $ 7,382,079
Other comprehensive income (loss) 61,958 (123,129)
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations (3,164) 33,093
OCI, net of tax 58,794 (90,036)
OCI attributable to the non-controlling interests (1,017) 1,650
Net current period OCI attributable to shareholders of AQN 57,777 (88,386)
Ending Balance 6,624,408 6,836,439
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (160,063) (71,677)
OCI, net of tax 57,777 (88,386)
Ending Balance (102,286) (160,063)
Foreign currency cumulative translation    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (98,467) (76,615)
Other comprehensive income (loss) (3,788) (18,013)
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations (1,598) (5,489)
OCI, net of tax (5,386) (23,502)
OCI attributable to the non-controlling interests (1,017) 1,650
Net current period OCI attributable to shareholders of AQN (6,403) (21,852)
Ending Balance (104,870) (98,467)
Unrealized gain (loss) on cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (97,809) (3,514)
Other comprehensive income (loss) 57,351 (128,838)
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations 2,136 34,543
OCI, net of tax 59,487 (94,295)
OCI attributable to the non-controlling interests 0 0
Net current period OCI attributable to shareholders of AQN 59,487 (94,295)
Ending Balance (38,322) (97,809)
Pension and post-employment actuarial changes    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance 36,213 8,452
Other comprehensive income (loss) 8,395 23,722
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations (3,702) 4,039
OCI, net of tax 4,693 27,761
OCI attributable to the non-controlling interests 0 0
Net current period OCI attributable to shareholders of AQN 4,693 27,761
Ending Balance $ 40,906 $ 36,213