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Segmented information - Results of Operations and Assets for Segments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue    
Revenue $ 2,212,141 $ 1,642,002
Other revenue 2,285,479 1,676,991
Fuel, power and water purchased 719,100 401,008
Net revenue 1,566,379 1,275,983
Operating expenses 702,128 516,820
Administrative expenses 66,726 63,122
Depreciation and amortization 402,963 314,123
Loss (gain) on foreign exchange 4,371 (2,108)
Gain on sale of renewable assets (29,063) 0
Operating income 419,254 384,026
Interest expense (209,554) (181,934)
Income (loss) from long-term investments (26,457) 664,738
Other (41,011) (74,419)
Earnings before income taxes 142,232 792,411
Property, plant and equipment 11,042,446 8,241,838
Investments carried at fair value 1,848,456 1,839,212
Equity-method investees 433,850 186,452
Total assets 16,785,836 13,224,149
Capital expenditures 1,345,045 786,030
Revenue related to net hedging loss, not recognized as revenue from contract with customers 57,018 28,586
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers 19,043 24,928
Other revenue    
Revenue    
Other revenue 73,338 34,989
Regulated Services Group    
Revenue    
Revenue 1,944,171 1,386,048
Fuel, power and water purchased 682,602 384,363
Net revenue 1,315,010 1,020,773
Operating expenses 597,850 442,851
Administrative expenses 37,179 36,749
Depreciation and amortization 280,452 219,089
Loss (gain) on foreign exchange 0 0
Gain on sale of renewable assets 0  
Operating income 399,529 322,084
Interest expense (93,411) (99,161)
Income (loss) from long-term investments 18,306 7,753
Other (24,177) (40,128)
Earnings before income taxes 300,247 190,548
Property, plant and equipment 7,394,151 5,757,532
Investments carried at fair value 2,296 0
Equity-method investees 37,492 74,673
Total assets 10,512,799 8,528,415
Capital expenditures 998,855 690,792
Regulated Services Group | Other revenue    
Revenue    
Other revenue 53,441 19,088
Renewable Energy Group    
Revenue    
Revenue 267,970 255,954
Fuel, power and water purchased 36,498 16,645
Net revenue 249,811 253,753
Operating expenses 104,262 73,957
Administrative expenses 28,298 25,743
Depreciation and amortization 121,414 92,890
Loss (gain) on foreign exchange 0 0
Gain on sale of renewable assets (29,063)  
Operating income 24,900 61,163
Interest expense (71,598) (52,656)
Income (loss) from long-term investments 84,046 93,998
Other (9,108) (6,537)
Earnings before income taxes 28,240 95,968
Property, plant and equipment 3,615,915 2,451,706
Investments carried at fair value 1,846,160 1,839,212
Equity-method investees 375,460 110,414
Total assets 6,123,888 4,586,878
Capital expenditures 338,637 80,746
Renewable Energy Group | Other revenue    
Revenue    
Other revenue 18,339 14,444
Corporate    
Revenue    
Revenue 0 0
Fuel, power and water purchased 0 0
Net revenue 1,558 1,457
Operating expenses 16 12
Administrative expenses 1,249 630
Depreciation and amortization 1,097 2,144
Loss (gain) on foreign exchange 4,371 (2,108)
Gain on sale of renewable assets 0  
Operating income (5,175) 779
Interest expense (44,545) (30,117)
Income (loss) from long-term investments (128,809) 562,987
Other (7,726) (27,754)
Earnings before income taxes (186,255) 505,895
Property, plant and equipment 32,380 32,600
Investments carried at fair value 0 0
Equity-method investees 20,898 1,365
Total assets 149,149 108,856
Capital expenditures 7,553 14,492
Corporate | Other revenue    
Revenue    
Other revenue $ 1,558 $ 1,457