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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, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance $ 4,406,595 $ 3,697,522
Other comprehensive income (loss) (8,739) 15,445
Amounts reclassified from AOCI to the consolidated statement of operations (4,698) (3,579)
Other comprehensive income (loss), net of tax (13,437) 11,866
OCI attributable to the non-controlling interests 691 (2,428)
Net current period OCI attributable to shareholders of AQN (12,746) 9,438
Ending Balance 5,662,190 4,406,595
Cumulative Effect, Period of Adoption, Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance   0
Foreign currency cumulative translation    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (68,822) (74,189)
Other comprehensive income (loss) 25,643 4,267
Amounts reclassified from AOCI to the consolidated statement of operations 2,763 3,528
Other comprehensive income (loss), net of tax 28,406 7,795
OCI attributable to the non-controlling interests 691 (2,428)
Net current period OCI attributable to shareholders of AQN 29,097 5,367
Ending Balance (39,725) (68,822)
Unrealized gain on cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance 75,099 64,333
Other comprehensive income (loss) (13,418) 19,177
Amounts reclassified from AOCI to the consolidated statement of operations (10,864) (8,597)
Other comprehensive income (loss), net of tax (24,282) 10,580
OCI attributable to the non-controlling interests 0 0
Net current period OCI attributable to shareholders of AQN (24,282) 10,580
Ending Balance 50,817 75,099
Pension and post-employment actuarial changes    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (16,038) (9,529)
Other comprehensive income (loss) (20,964) (7,999)
Amounts reclassified from AOCI to the consolidated statement of operations 3,403 1,490
Other comprehensive income (loss), net of tax (17,561) (6,509)
OCI attributable to the non-controlling interests 0 0
Net current period OCI attributable to shareholders of AQN (17,561) (6,509)
Ending Balance (33,599) (16,038)
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (9,761) (19,385)
Ending Balance $ (22,507) (9,761)
Adoption of ASU 2017-12 on hedging | Cumulative Effect, Period of Adoption, Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance   186
Adoption of ASU 2017-12 on hedging | Foreign currency cumulative translation | Cumulative Effect, Period of Adoption, Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance   0
Adoption of ASU 2017-12 on hedging | Unrealized gain on cash flow hedges | Cumulative Effect, Period of Adoption, Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance   186
Adoption of ASU 2017-12 on hedging | Pension and post-employment actuarial changes | Cumulative Effect, Period of Adoption, Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance   $ 0