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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue          
Revenue $ 343,638 $ 343,578 $ 808,539 $ 820,803  
Fuel, power and water purchased 68,099 76,127 195,200 233,654  
Net revenue 275,539 267,451 613,339 587,149  
Operating expenses 121,462 120,187 249,358 240,300  
Administrative expenses 19,361 13,524 35,033 26,642  
Depreciation and amortization 75,667 69,813 154,547 140,860  
Gain (loss) on foreign exchange (24) 1,467 (4,694) 934  
Operating income 59,073 62,460 179,095 178,413  
Interest expense (44,818) (45,840) (91,066) (88,461)  
Income from long-term investments 334,809 160,662 172,148 180,134  
Other (29,168) (9,141) (33,357) (13,194)  
Earnings before income taxes 319,896 168,141 226,820 256,892  
Property, plant and equipment 7,142,863   7,142,863   $ 7,231,664
Investments carried at fair value 1,417,524   1,417,524   1,294,147
Equity-method investees 119,798   119,798   83,497
Total assets 11,188,028   11,188,028   10,911,470
Capital expenditures 186,407 105,664 342,309 213,050  
Revenue related to net hedging gains, not recognized as revenue from contract with customers 7,447 5,200 16,739 11,640  
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers 4,761 3,460   (3,561)  
Regulated Services Group          
Revenue          
Revenue 279,458 281,607 675,518 692,631  
Fuel, power and water purchased 65,358 73,469 188,455 224,075  
Net revenue 214,100 208,138 487,063 468,556  
Operating expenses 105,067 102,021 213,434 203,996  
Administrative expenses 9,198 6,546 18,685 11,979  
Depreciation and amortization 52,629 47,034 105,639 95,451  
Gain (loss) on foreign exchange 0 0 0 0  
Operating income 47,206 52,537 149,305 157,130  
Interest expense (24,097) (26,057) (48,937) (51,149)  
Income from long-term investments 2,962 1,854 5,610 3,111  
Other (19,695) (8,796) (24,692) (10,756)  
Earnings before income taxes 6,376 19,538 81,286 98,336  
Property, plant and equipment 4,695,303   4,695,303   4,754,373
Investments carried at fair value 26,650   26,650   27,072
Equity-method investees 43,152   43,152   29,827
Total assets 6,896,472   6,896,472   6,816,063
Capital expenditures 157,641 104,758 297,273 202,173  
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers     7,730    
Renewable Energy Group          
Revenue          
Revenue 64,180 61,971 133,021 128,172  
Fuel, power and water purchased 2,741 2,658 6,745 9,579  
Net revenue 61,439 59,313 126,276 118,593  
Operating expenses 16,395 18,166 35,924 36,304  
Administrative expenses 8,052 7,335 14,258 14,889  
Depreciation and amortization 22,803 22,536 48,431 44,921  
Gain (loss) on foreign exchange 0 0 0 0  
Operating income 14,189 11,276 27,663 22,479  
Interest expense (13,618) (16,237) (28,097) (32,444)  
Income from long-term investments 22,551 37,050 46,345 60,547  
Other (883) 77 (49) (73)  
Earnings before income taxes 22,239 32,166 45,862 50,509  
Property, plant and equipment 2,412,441   2,412,441   2,444,382
Investments carried at fair value 1,390,874   1,390,874   1,267,075
Equity-method investees 76,646   76,646   53,670
Total assets 4,167,458   4,167,458   4,014,067
Capital expenditures 28,766 906 45,036 10,877  
Corporate          
Revenue          
Revenue 0 0 0 0  
Fuel, power and water purchased 0 0 0 0  
Net revenue 0 0 0 0  
Operating expenses 0 0 0 0  
Administrative expenses 2,111 (357) 2,090 (226)  
Depreciation and amortization 235 243 477 488  
Gain (loss) on foreign exchange (24) 1,467 (4,694) 934  
Operating income (2,322) (1,353) 2,127 (1,196)  
Interest expense (7,103) (3,546) (14,032) (4,868)  
Income from long-term investments 309,296 121,758 120,193 116,476  
Other (8,590) (422) (8,616) (2,365)  
Earnings before income taxes 291,281 116,437 99,672 108,047  
Property, plant and equipment 35,119   35,119   32,909
Investments carried at fair value 0   0   0
Equity-method investees 0   0   0
Total assets 124,098   124,098   $ 81,340
Capital expenditures $ 0 $ 0 $ 0 $ 0