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Segmented information - Results of Operations and Assets for Segments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Revenue    
Revenue $ 2,612,036 $ 2,680,836
Other revenue 2,698,015 2,765,013
Fuel, power and water purchased 735,945 866,354
Net revenue 1,962,070 1,898,659
Operating expenses 906,985 851,489
Administrative expenses (recovery) 90,359 80,232
Depreciation and amortization 466,996 455,520
Asset impairment charge 23,492 159,568
Loss on foreign exchange 8,359 13,833
Operating income (loss), before gain on sale of renewable assets   338,017
Gain on sale of renewable assets 0 64,028
Operating income 465,879 402,045
Interest expense (353,656) (278,574)
Income (loss) from long-term investments (83,564) (465,206)
Other expenses (148,264) (27,933)
Loss before income taxes (119,605) (369,668)
Property, plant and equipment 12,517,450 11,944,885
Investments carried at fair value 1,115,729 1,344,207
Equity-method investees 456,393 381,802
Total assets 18,373,961 17,627,613
Capital expenditures 1,026,171 1,089,024
Revenue related to net hedging loss, not recognized as revenue from contract with customers 5,695 63,717
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers 32,839 21,640
Other revenue    
Revenue    
Other revenue 85,979 84,177
Regulated Services Group | Operating Segments    
Revenue    
Revenue 2,315,722 2,330,039
Fuel, power and water purchased 716,446 824,670
Net revenue 1,650,413 1,559,598
Operating expenses 786,608 736,515
Administrative expenses (recovery) 46,386 46,484
Depreciation and amortization 346,188 317,300
Asset impairment charge 0 0
Loss on foreign exchange 0 0
Operating income (loss), before gain on sale of renewable assets   459,299
Gain on sale of renewable assets   0
Operating income 471,231 459,299
Interest expense (160,998) (113,482)
Income (loss) from long-term investments 44,953 21,884
Other expenses (121,146) (14,765)
Loss before income taxes 234,040 352,936
Property, plant and equipment 8,945,637 8,554,938
Investments carried at fair value 1,962 1,984
Equity-method investees 112,180 56,199
Total assets 12,658,955 12,109,575
Capital expenditures 816,788 908,676
Regulated Services Group | Operating Segments | Other revenue    
Revenue    
Other revenue 51,137 54,229
Renewable Energy Group | Operating Segments    
Revenue    
Revenue 296,314 350,797
Fuel, power and water purchased 19,499 41,684
Net revenue 310,210 337,560
Operating expenses 119,013 114,463
Administrative expenses (recovery) 36,554 26,424
Depreciation and amortization 119,576 137,203
Asset impairment charge 23,492 159,568
Loss on foreign exchange 0 0
Operating income (loss), before gain on sale of renewable assets   (100,098)
Gain on sale of renewable assets   64,028
Operating income 11,575 (36,070)
Interest expense (61,261) (64,285)
Income (loss) from long-term investments 102,188 15,254
Other expenses (4,002) (570)
Loss before income taxes 48,500 (85,671)
Property, plant and equipment 3,539,069 3,360,687
Investments carried at fair value 1,113,767 1,342,223
Equity-method investees 343,712 310,103
Total assets 5,367,011 5,251,933
Capital expenditures 209,383 180,348
Renewable Energy Group | Operating Segments | Other revenue    
Revenue    
Other revenue 33,395 28,447
Corporate | Corporate    
Revenue    
Revenue 0 0
Fuel, power and water purchased 0 0
Net revenue 1,447 1,501
Operating expenses 1,364 511
Administrative expenses (recovery) 7,419 7,324
Depreciation and amortization 1,232 1,017
Asset impairment charge 0 0
Loss on foreign exchange 8,359 13,833
Operating income (loss), before gain on sale of renewable assets   (21,184)
Gain on sale of renewable assets   0
Operating income (16,927) (21,184)
Interest expense (131,397) (100,807)
Income (loss) from long-term investments (230,705) (502,344)
Other expenses (23,116) (12,598)
Loss before income taxes (402,145) (636,933)
Property, plant and equipment 32,744 29,260
Investments carried at fair value 0 0
Equity-method investees 501 15,500
Total assets 347,995 266,105
Capital expenditures 0 0
Corporate | Corporate | Other revenue    
Revenue    
Other revenue $ 1,447 $ 1,501