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Segmented information - Results of Operations and Assets for Segments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue    
Revenue $ 1,677,058 $ 1,626,392
Fuel, power and water purchased 401,008 443,304
Net revenue 1,276,050 1,183,088
Operating expenses 520,452 471,989
Administrative expenses 59,490 56,802
Depreciation and amortization 314,123 284,304
Gain (loss) on foreign exchange (2,108) 3,146
Operating income 384,093 366,847
Interest expense (181,934) (181,488)
Income from long-term investments 664,671 397,621
Other (74,419) (27,913)
Earnings before income taxes 792,411 555,067
Property, plant and equipment 8,241,838 7,240,980
Investments carried at fair value 1,837,429 1,294,147
Equity-method investees 186,452 82,111
Total assets 13,223,906 10,920,786
Capital expenditures 786,030 581,332
Revenue related to net hedging gains, not recognized as revenue from contract with customers 28,586 22,282
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers 24,928 (4,405)
Regulated Services Group    
Revenue    
Revenue 1,405,136 1,368,411
Fuel, power and water purchased 384,363 426,046
Net revenue 1,020,773 942,365
Operating expenses 445,459 397,092
Administrative expenses 34,141 36,667
Depreciation and amortization 219,089 194,766
Gain (loss) on foreign exchange 0 0
Operating income 322,084 313,840
Interest expense (99,161) (101,518)
Income from long-term investments 7,753 9,334
Other (40,128) (32,297)
Earnings before income taxes 190,548 189,359
Property, plant and equipment 5,757,532 4,763,689
Investments carried at fair value 0 27,072
Equity-method investees 74,673 29,827
Total assets 8,528,172 6,825,379
Capital expenditures 690,792 478,936
Renewable Energy Group    
Revenue    
Revenue 270,398 256,510
Fuel, power and water purchased 16,645 17,258
Net revenue 253,753 239,252
Operating expenses 74,981 74,676
Administrative expenses 24,719 19,366
Depreciation and amortization 92,890 88,557
Gain (loss) on foreign exchange 0 0
Operating income 61,163 56,653
Interest expense (52,656) (61,039)
Income from long-term investments 96,652 104,025
Other (6,537) 15,951
Earnings before income taxes 98,622 115,590
Property, plant and equipment 2,451,706 2,444,382
Investments carried at fair value 1,837,429 1,267,075
Equity-method investees 111,779 52,284
Total assets 4,589,521 4,014,067
Capital expenditures 80,746 102,396
Corporate    
Revenue    
Revenue 1,524 1,471
Fuel, power and water purchased 0 0
Net revenue 1,524 1,471
Operating expenses 12 221
Administrative expenses 630 769
Depreciation and amortization 2,144 981
Gain (loss) on foreign exchange (2,108) 3,146
Operating income 846 (3,646)
Interest expense (30,117) (18,931)
Income from long-term investments 560,266 284,262
Other (27,754) (11,567)
Earnings before income taxes 503,241 250,118
Property, plant and equipment 32,600 32,909
Investments carried at fair value 0 0
Equity-method investees 0 0
Total assets 106,213 81,340
Capital expenditures $ 14,492 $ 0