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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

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