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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance $ 7,274,807 $ 5,954,661 $ 7,382,079 $ 5,662,190 $ 5,662,190
OCI     (121,716)   (90,838)
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations     9,270   48,288
OCI, net of tax (61,412) (34,241) (112,446) (25,250) (42,550)
OCI attributable to the non-controlling interests     753   (249)
Net current period OCI attributable to shareholders of AQN     (111,693)   (42,799)
Amounts reclassified from AOCI to non-controlling interest         (6,371)
Ending Balance 7,031,067 6,649,047 7,031,067 6,649,047 7,382,079
Total          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance (123,398) (20,272) (71,677) (22,507) (22,507)
OCI, net of tax (59,972) (35,785) (111,693) (27,179)  
Ending Balance (183,370) $ (56,057) (183,370) (56,057) (71,677)
Foreign currency cumulative translation          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     (76,615) (39,725) (39,725)
OCI     (39,864)   (25,982)
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations     (731)   (4,288)
OCI, net of tax     (40,595)   (30,270)
OCI attributable to the non-controlling interests     753   (249)
Net current period OCI attributable to shareholders of AQN     (39,842)   (30,519)
Amounts reclassified from AOCI to non-controlling interest         (6,371)
Ending Balance (116,457)   (116,457)   (76,615)
Unrealized gain on cash flow hedges          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     (3,514) 50,817 50,817
OCI     (81,852)   (97,103)
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations     10,087   42,772
OCI, net of tax     (71,765)   (54,331)
OCI attributable to the non-controlling interests     0   0
Net current period OCI attributable to shareholders of AQN     (71,765)   (54,331)
Amounts reclassified from AOCI to non-controlling interest         0
Ending Balance (75,279)   (75,279)   (3,514)
Pension and post-employment actuarial changes          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     8,452 $ (33,599) (33,599)
OCI     0   32,247
Amounts reclassified from AOCI to the unaudited interim consolidated statements of operations     (86)   9,804
OCI, net of tax     (86)   42,051
OCI attributable to the non-controlling interests     0   0
Net current period OCI attributable to shareholders of AQN     (86)   42,051
Amounts reclassified from AOCI to non-controlling interest         0
Ending Balance $ 8,366   $ 8,366   $ 8,452