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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Revenue          
Revenue $ 604,110 $ 508,654 $ 1,315,089 $ 1,126,574  
Other revenue 624,259 527,523 1,359,956 1,162,065  
Fuel, power and water purchased 170,954 154,464 420,432 407,914  
Net revenue 453,305 373,059 939,524 754,151  
Operating expenses 206,330 171,082 418,332 351,139  
Administrative expenses 20,107 17,122 37,559 33,765  
Depreciation and amortization 112,547 98,161 232,511 195,600  
Loss on foreign exchange 4,464 1,283 4,726 2,145  
Operating income (loss) before gain on sale of renewable assets     246,396    
Gain on sale of renewable assets 0 0 1,200 0  
Operating income 109,857 85,411 247,596 171,502  
Interest expense (64,573) (58,182) (122,516) (107,762)  
Income (loss) from long-term investments (113,380) 60,506 (124,069) 9,999  
Other expenses (17,045) (7,028) (24,102) (18,007)  
Earnings (loss) before income taxes (85,141) 80,707 (23,091) 55,732  
Property, plant and equipment 11,881,779   11,881,779   $ 11,042,446
Investments carried at fair value 1,663,092   1,663,092   1,848,456
Equity-method investees 396,305   396,305   433,850
Total assets 17,737,876   17,737,876   16,785,836
Capital expenditures 380,848 407,743 708,547 703,132  
Revenue related to net hedging loss, not recognized as revenue from contract with customers 25,062   29,892 44,587  
Revenue related to net hedging gain, not recognized as revenue from contract with customers   4,996      
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers 8,811 5,118 15,089 7,479  
Other revenue          
Revenue          
Other revenue 20,149 18,869 44,867 35,491  
Corporate          
Revenue          
Revenue 0 0 0 0  
Fuel, power and water purchased 0 0 0 0  
Net revenue 382 397 768 783  
Operating expenses 19 2 22 5  
Administrative expenses 631 785 2,468 3,702  
Depreciation and amortization 262 272 526 566  
Loss on foreign exchange 4,464 1,283 4,726 2,145  
Operating income (loss) before gain on sale of renewable assets     (6,974)    
Gain on sale of renewable assets     0    
Operating income (4,994) (1,945) (6,974) (5,635)  
Interest expense (13,099) (10,616) (33,903) (19,602)  
Income (loss) from long-term investments (145,320) 25,225 (188,144) (48,873)  
Other expenses (6,602) (95) (8,023) (1,707)  
Earnings (loss) before income taxes (170,015) 12,569 (237,044) (75,817)  
Property, plant and equipment 30,859   30,859   32,380
Investments carried at fair value 0   0   0
Equity-method investees 15,755   15,755   20,898
Total assets 212,680   212,680   149,149
Capital expenditures 0 0 0 0  
Corporate | Other revenue          
Revenue          
Other revenue 382 397 768 783  
Regulated Services Group | Operating Segments          
Revenue          
Revenue 507,095 430,764 1,129,854 1,017,901  
Fuel, power and water purchased 159,256 148,403 393,828 393,925  
Net revenue 360,398 296,461 763,573 649,542  
Operating expenses 179,258 145,723 363,667 297,905  
Administrative expenses 10,966 9,912 19,036 17,455  
Depreciation and amortization 76,228 67,520 156,511 135,087  
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 93,946 73,306 224,359 199,095  
Interest expense (23,859) (27,114) (45,285) (51,415)  
Income (loss) from long-term investments 5,265 9,293 9,774 10,467  
Other expenses (2,898) (4,155) (7,786) (12,646)  
Earnings (loss) before income taxes 72,454 51,330 181,062 145,501  
Property, plant and equipment 8,176,765   8,176,765   7,394,151
Investments carried at fair value 2,042   2,042   2,296
Equity-method investees 37,228   37,228   37,492
Total assets 11,543,883   11,543,883   10,512,799
Capital expenditures 313,188 341,431 568,773 553,950  
Regulated Services Group | Operating Segments | Other revenue          
Revenue          
Other revenue 12,559 14,100 27,547 25,566  
Renewable Energy Group | Other revenue          
Revenue          
Other revenue       9,142  
Renewable Energy Group | Operating Segments          
Revenue          
Revenue 97,015 77,890 185,235 108,673  
Fuel, power and water purchased 11,698 6,061 26,604 13,989  
Net revenue 92,525 76,201 175,183 103,826  
Operating expenses 27,053 25,357 54,643 53,229  
Administrative expenses 8,510 6,425 16,055 12,608  
Depreciation and amortization 36,057 30,369 75,474 59,947  
Loss on foreign exchange 0 0 0 0  
Operating income (loss) before gain on sale of renewable assets     29,011    
Gain on sale of renewable assets     1,200    
Operating income 20,905 14,050 30,211 (21,958)  
Interest expense (27,615) (20,452) (43,328) (36,745)  
Income (loss) from long-term investments 26,675 25,988 54,301 48,405  
Other expenses (7,545) (2,778) (8,293) (3,654)  
Earnings (loss) before income taxes 12,420 16,808 32,891 (13,952)  
Property, plant and equipment 3,674,155   3,674,155   3,615,915
Investments carried at fair value 1,661,050   1,661,050   1,846,160
Equity-method investees 343,322   343,322   375,460
Total assets 5,981,313   5,981,313   $ 6,123,888
Capital expenditures 67,660 66,312 139,774 $ 149,182  
Renewable Energy Group | Operating Segments | Other revenue          
Revenue          
Other revenue $ 7,208 $ 4,372 $ 16,552