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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Revenue          
Revenue $ 527,523 $ 343,638 $ 1,162,065 $ 808,539  
Fuel, power and water purchased 154,464 68,099 407,914 195,200  
Net revenue 373,059 275,539 754,151 613,339  
Operating expenses 169,978 122,938 351,139 249,672  
Administrative expenses (recovery) 18,226 17,885 33,765 34,719  
Depreciation and amortization 98,161 75,667 195,600 154,547  
Gain (loss) on foreign exchange 1,283 (24) 2,145 (4,694)  
Operating income 85,411 59,073 171,502 179,095  
Interest expense (58,182) (44,818) (107,762) (91,066)  
Income from long-term investments 60,506 334,809 9,999 172,148  
Other expenses (7,028) (29,168) (18,007) (33,357)  
Earnings before income taxes 80,707 319,896 55,732 226,820  
Property, plant and equipment 10,905,273   10,905,273   $ 8,241,838
Investments carried at fair value 1,929,128   1,929,128   1,839,212
Equity-method investees 264,251   264,251   186,452
Total assets 16,453,651   16,453,651   13,224,149
Capital expenditures 407,743 186,407 703,132 342,309  
Revenue related to net hedging gains, not recognized as revenue from contract with customers 4,996 7,447 44,587 16,739  
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers 5,118 4,761 7,479 7,730  
Regulated Services Group | Operating Segments          
Revenue          
Revenue 444,864 279,458 1,043,467 675,518  
Fuel, power and water purchased 148,403 65,358 393,925 188,455  
Net revenue 296,461 214,100 649,542 487,063  
Operating expenses 144,774 105,067 297,910 213,434  
Administrative expenses (recovery) 11,561 9,198 19,101 18,685  
Depreciation and amortization 67,520 52,629 135,087 105,639  
Gain (loss) on foreign exchange 0 0 0 0  
Operating income 72,606 47,206 197,444 149,305  
Interest expense (27,114) (24,097) (51,415) (48,937)  
Income from long-term investments 9,695 2,962 10,869 5,610  
Other expenses (4,155) (19,695) (12,646) (24,692)  
Earnings before income taxes 51,032 6,376 144,252 81,286  
Property, plant and equipment 7,110,770   7,110,770   5,757,532
Investments carried at fair value 2,499   2,499   0
Equity-method investees 11,548   11,548   74,673
Total assets 10,148,986   10,148,986   8,528,415
Capital expenditures 341,431 157,641 553,950 297,273  
Renewable Energy Group | Operating Segments          
Revenue          
Revenue 82,262 64,180 117,815 133,021  
Fuel, power and water purchased 6,061 2,741 13,989 6,745  
Net revenue 76,201 61,439 103,826 126,276  
Operating expenses 25,204 17,871 53,229 36,238  
Administrative expenses (recovery) 7,303 8,052 13,486 14,258  
Depreciation and amortization 30,369 22,803 59,947 48,431  
Gain (loss) on foreign exchange 0 0 0 0  
Operating income 13,325 12,713 (22,836) 27,349  
Interest expense (20,452) (13,618) (36,745) (28,097)  
Income from long-term investments 25,988 23,839 48,405 47,605  
Other expenses (2,778) (883) (3,654) (49)  
Earnings before income taxes 16,083 22,051 (14,830) 46,808  
Property, plant and equipment 3,763,057   3,763,057   2,451,706
Investments carried at fair value 1,926,629   1,926,629   1,839,212
Equity-method investees 252,703   252,703   110,414
Total assets 6,187,072   6,187,072   4,586,878
Capital expenditures 66,312 28,766 149,182 45,036  
Corporate | Corporate, Non-Segment          
Revenue          
Revenue 397 0 783 0  
Fuel, power and water purchased 0 0 0 0  
Net revenue 397 0 783 0  
Operating expenses 0 0 0 0  
Administrative expenses (recovery) (638) 635 1,178 1,776  
Depreciation and amortization 272 235 566 477  
Gain (loss) on foreign exchange 1,283 (24) 2,145 (4,694)  
Operating income (520) (846) (3,106) 2,441  
Interest expense (10,616) (7,103) (19,602) (14,032)  
Income from long-term investments 24,823 308,008 (49,275) 118,933  
Other expenses (95) (8,590) (1,707) (8,616)  
Earnings before income taxes 13,592 291,469 (73,690) 98,726  
Property, plant and equipment 31,446   31,446   32,600
Investments carried at fair value 0   0   0
Equity-method investees 0   0   1,365
Total assets 117,593   117,593   $ 108,856
Capital expenditures $ 0 $ 0 $ 0 $ 0