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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance $ 5,954,661 $ 4,204,068 $ 5,662,190 $ 4,406,595 $ 4,406,595
OCI     (69,077)   (8,739)
Amounts reclassified from AOCI to the consolidated statement of operations     43,827   (4,698)
OCI, net of tax (34,241) 2,415 (25,250) (48,379) (13,437)
OCI attributable to the non-controlling interests     (8,300)   691
Net current period OCI attributable to shareholders of AQN     (33,550)   (12,746)
Ending Balance 6,649,047 $ 4,523,329 6,649,047 4,523,329 5,662,190
Foreign currency cumulative translation          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     (39,725) (68,822) (68,822)
OCI     (5,910)   25,643
Amounts reclassified from AOCI to the consolidated statement of operations     2,642   2,763
OCI, net of tax     (3,268)   28,406
OCI attributable to the non-controlling interests     (8,300)   691
Net current period OCI attributable to shareholders of AQN     (11,568)   29,097
Ending Balance (51,293)   (51,293)   (39,725)
Unrealized gain on cash flow hedges          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     50,817 75,099 75,099
OCI     (63,167)   (13,418)
Amounts reclassified from AOCI to the consolidated statement of operations     39,020   (10,864)
OCI, net of tax     (24,147)   (24,282)
OCI attributable to the non-controlling interests     0   0
Net current period OCI attributable to shareholders of AQN     (24,147)   (24,282)
Ending Balance 26,670   26,670   50,817
Pension and post-employment actuarial changes          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     (33,599) (16,038) (16,038)
OCI     0   (20,964)
Amounts reclassified from AOCI to the consolidated statement of operations     2,165   3,403
OCI, net of tax     2,165   (17,561)
OCI attributable to the non-controlling interests     0   0
Net current period OCI attributable to shareholders of AQN     2,165   (17,561)
Ending Balance (31,434)   (31,434)   (33,599)
Total          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance     (22,507) $ (9,761) (9,761)
Ending Balance $ (56,057)   $ (56,057)   $ (22,507)