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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, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance $ 5,662,190 $ 4,406,595
OCI (90,838) (8,739)
Amounts reclassified from AOCI to the consolidated statement of operations 48,288 (4,698)
OCI, net of tax (42,550) (13,437)
OCI attributable to the non-controlling interests (249) 691
Net current period OCI attributable to shareholders of AQN (42,799) (12,746)
Amount reclassified from AOCI to non-controlling interest (note 3(g)) (6,371)  
Ending Balance 7,382,079 5,662,190
Foreign currency cumulative translation    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (39,725) (68,822)
OCI (25,982) 25,643
Amounts reclassified from AOCI to the consolidated statement of operations (4,288) 2,763
OCI, net of tax (30,270) 28,406
OCI attributable to the non-controlling interests (249) 691
Net current period OCI attributable to shareholders of AQN (30,519) 29,097
Amount reclassified from AOCI to non-controlling interest (note 3(g)) (6,371)  
Ending Balance (76,615) (39,725)
Unrealized gain on cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance 50,817 75,099
OCI (97,103) (13,418)
Amounts reclassified from AOCI to the consolidated statement of operations 42,772 (10,864)
OCI, net of tax (54,331) (24,282)
OCI attributable to the non-controlling interests 0 0
Net current period OCI attributable to shareholders of AQN (54,331) (24,282)
Amount reclassified from AOCI to non-controlling interest (note 3(g)) 0  
Ending Balance (3,514) 50,817
Pension and post-employment actuarial changes    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (33,599) (16,038)
OCI 32,247 (20,964)
Amounts reclassified from AOCI to the consolidated statement of operations 9,804 3,403
OCI, net of tax 42,051 (17,561)
OCI attributable to the non-controlling interests 0 0
Net current period OCI attributable to shareholders of AQN 42,051 (17,561)
Amount reclassified from AOCI to non-controlling interest (note 3(g)) 0  
Ending Balance 8,452 (33,599)
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (22,507) (9,761)
Ending Balance $ (71,677) $ (22,507)