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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

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