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Segmented information - Results of Operations and Assets for Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Revenue          
Revenue $ 603,927 $ 599,236 $ 1,356,804 $ 1,307,755  
Other revenue 627,871 619,385 1,406,498 1,352,622  
Fuel, power and water purchased 142,156 168,902 417,112 416,413  
Net revenue 485,715 450,483 989,386 936,209  
Operating expenses (recovery) 241,482 206,330 461,769 418,332  
Administrative expenses 25,692 20,107 43,525 37,559  
Depreciation and amortization 118,448 112,547 240,089 232,511  
Loss on foreign exchange 6,379 4,464 7,815 4,726  
Operating income (loss), before gain on sale of renewable assets       243,081  
Gain on sale of renewable assets 0 0 0 1,200  
Operating income 93,714 107,035 236,188 244,281  
Interest expense (89,663) (64,573) (171,581) (122,516)  
Income (loss) from long-term investments (277,696) (113,380) (57,684) (124,069)  
Other expenses (44,634) (14,223) (50,891) (20,787)  
Loss before income taxes (318,279) (85,141) (43,968) (23,091)  
Property, plant and equipment 12,336,931   12,336,931   $ 11,944,885
Investments carried at fair value 1,213,718   1,213,718   1,344,207
Equity-method investees 388,516   388,516   381,802
Total assets 17,968,713   17,968,713   17,627,613
Capital expenditures 245,209 247,538 414,958 575,237  
Revenue related to net hedging loss, not recognized as revenue from contract with customers 4,328 25,062   29,892  
Revenue related to net hedging gain, not recognized as revenue from contract with customers     11,527    
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers 9,083 8,811 12,789 15,089  
Other revenue          
Revenue          
Other revenue 23,944 20,149 49,694 44,867  
Corporate          
Revenue          
Revenue 0 0 0 0  
Fuel, power and water purchased 0 0 0 0  
Net revenue 364 382 725 768  
Operating expenses (recovery) (146) 19 7 22  
Administrative expenses 1,100 631 3,178 2,468  
Depreciation and amortization 403 262 642 526  
Loss on foreign exchange 6,379 4,464 7,815 4,726  
Operating income (loss), before gain on sale of renewable assets       (6,974)  
Gain on sale of renewable assets       0  
Operating income (7,372) (4,994) (10,917) (6,974)  
Interest expense (30,519) (25,851) (59,064) (46,655)  
Income (loss) from long-term investments (313,287) (145,320) (136,870) (188,144)  
Other expenses (2,427) (6,602) (4,435) (8,023)  
Loss before income taxes (353,605) (182,767) (211,286) (249,796)  
Property, plant and equipment 29,316   29,316   29,260
Investments carried at fair value 0   0   0
Equity-method investees 8,789   8,789   15,500
Total assets 319,237   319,237   266,105
Capital expenditures 0 0 0 0  
Corporate | Other revenue          
Revenue          
Other revenue 364 382 725 768  
Regulated Services Group | Operating Segments          
Revenue          
Revenue 532,233 507,095 1,206,394 1,129,854  
Fuel, power and water purchased 138,374 159,256 405,524 393,828  
Net revenue 408,059 360,398 829,088 763,573  
Operating expenses (recovery) 213,891 179,258 401,315 363,667  
Administrative expenses 13,548 10,966 21,873 19,036  
Depreciation and amortization 84,754 76,228 170,611 156,511  
Loss on foreign exchange 0 0 0 0  
Operating income (loss), before gain on sale of renewable assets       224,359  
Gain on sale of renewable assets       0  
Operating income 95,866 93,946 235,289 224,359  
Interest expense (42,724) (23,860) (81,202) (45,286)  
Income (loss) from long-term investments 9,332 5,265 19,660 9,774  
Other expenses (41,010) (2,898) (45,259) (7,786)  
Loss before income taxes 21,464 72,453 128,488 181,061  
Property, plant and equipment 8,757,413   8,757,413   8,554,938
Investments carried at fair value 1,799   1,799   1,984
Equity-method investees 57,586   57,586   56,199
Total assets 12,247,694   12,247,694   12,109,575
Capital expenditures 225,505 179,878 372,886 435,463  
Regulated Services Group | Operating Segments | Other revenue          
Revenue          
Other revenue 14,200 12,559 28,218 27,547  
Renewable Energy Group | Operating Segments          
Revenue          
Revenue 71,694 92,141 150,410 177,901  
Fuel, power and water purchased 3,782 9,646 11,588 22,585  
Net revenue 77,292 89,703 159,573 171,868  
Operating expenses (recovery) 27,737 27,053 60,447 54,643  
Administrative expenses 11,044 8,510 18,474 16,055  
Depreciation and amortization 33,291 36,057 68,836 75,474  
Loss on foreign exchange 0 0 0 0  
Operating income (loss), before gain on sale of renewable assets       25,696  
Gain on sale of renewable assets       1,200  
Operating income 5,220 18,083 11,816 26,896  
Interest expense (16,420) (14,862) (31,315) (30,575)  
Income (loss) from long-term investments 26,259 26,675 59,526 54,301  
Other expenses (1,197) (4,723) (1,197) (4,978)  
Loss before income taxes 13,862 25,173 38,830 45,644  
Property, plant and equipment 3,550,202   3,550,202   3,360,687
Investments carried at fair value 1,211,919   1,211,919   1,342,223
Equity-method investees 322,141   322,141   310,103
Total assets 5,401,782   5,401,782   $ 5,251,933
Capital expenditures 19,704 67,660 42,072 139,774  
Renewable Energy Group | Operating Segments | Other revenue          
Revenue          
Other revenue $ 9,380 $ 7,208 $ 20,751 $ 16,552