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Segmented information - Results of Operations and Assets for Segments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue    
Revenue $ 1,624,921 $ 1,648,463
Fuel, power and water purchased 443,304 484,138
Net revenue 1,181,617 1,164,325
Operating expenses 471,989 472,466
Administrative expenses 56,802 52,710
Depreciation and amortization 284,304 260,772
Loss on foreign exchange 3,146 (58)
Operating income 365,376 378,435
Interest expense (181,488) (152,118)
Income (loss) from long-term investments (399,092) 84,818
Other income (expenses) (27,913) (9,038)
Earnings before income taxes 555,067 132,461
Property, plant and equipment 7,231,664 6,393,558
Investments carried at fair value 1,294,147 814,530
Equity-method investees (d) 83,770 29,588
Total assets 10,911,470 9,398,589
Capital expenditures 581,332 466,369
Revenue related to net hedging gains, not recognized as revenue from contract with customers 22,282 14,953
Regulated Services Group    
Revenue    
Revenue 1,366,971 1,401,240
Fuel, power and water purchased 426,046 456,974
Net revenue 940,925 944,266
Operating expenses 396,559 401,486
Administrative expenses 36,628 33,234
Depreciation and amortization 194,498 177,719
Loss on foreign exchange 0 0
Operating income 313,240 331,827
Interest expense (101,518) (99,063)
Income (loss) from long-term investments (9,334) (5,558)
Other income (expenses) (32,292) (6,775)
Earnings before income taxes 188,764 231,547
Property, plant and equipment 4,754,373 4,210,115
Investments carried at fair value 27,072 0
Equity-method investees (d) 29,827 55
Total assets 6,816,063 6,022,262
Capital expenditures 478,936 370,221
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers (4,405) 7,425
Renewable Energy Group    
Revenue    
Revenue 257,950 247,223
Fuel, power and water purchased 17,258 27,164
Net revenue 240,692 220,059
Operating expenses 75,209 70,980
Administrative expenses 19,405 18,539
Depreciation and amortization 88,825 82,044
Loss on foreign exchange 0 0
Operating income 57,253 48,496
Interest expense (61,039) (50,920)
Income (loss) from long-term investments (104,025) (45,741)
Other income (expenses) 15,946 (1,576)
Earnings before income taxes 116,185 41,741
Property, plant and equipment 2,444,382 2,152,420
Investments carried at fair value 1,267,075 814,530
Equity-method investees (d) 53,670 29,273
Total assets 4,014,067 3,269,786
Capital expenditures 102,396 96,148
Corporate    
Revenue    
Revenue 0 0
Fuel, power and water purchased 0 0
Net revenue 0 0
Operating expenses 221 0
Administrative expenses 769 937
Depreciation and amortization 981 1,009
Loss on foreign exchange 3,146 (58)
Operating income (5,117) (1,888)
Interest expense (18,931) (2,135)
Income (loss) from long-term investments (285,733) 136,117
Other income (expenses) (11,567) (687)
Earnings before income taxes 250,118 (140,827)
Property, plant and equipment 32,909 31,023
Investments carried at fair value 0 0
Equity-method investees (d) 273 260
Total assets 81,340 106,541
Capital expenditures $ 0 $ 0