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Segmented information - Results of Operations and Assets for Segments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue    
Revenue $ 1,647,387 $ 1,521,938
Fuel, power and water purchased 484,138 393,225
Net revenue 1,163,249 1,128,713
Operating expenses 472,466 450,231
Administrative expenses 52,710 49,640
Depreciation and amortization 260,772 251,314
Gain on foreign exchange (58) 323
Operating income 377,359 377,205
Interest expense 152,118 155,822
Interest, dividend, equity and other income (53,139) (9,238)
Change in value of investment carried at fair value 137,957 0
Other expenses 7,962 55,489
Earnings (loss) before income taxes 132,461 175,132
Property, plant and equipment 6,393,558 6,304,897
Investment carried at fair value 814,530 0
Equity-method investees 30,492 32,267
Total assets 9,388,968 8,395,567
Capital expenditures 466,369 565,103
Revenue related to net hedging gains, not recognized as revenue from contract with customers 14,953  
Liberty Utilities Group    
Revenue    
Revenue 1,400,164 1,290,786
Fuel, power and water purchased 456,974 373,635
Net revenue 943,190 917,151
Operating expenses 401,486 383,380
Administrative expenses 33,234 33,037
Depreciation and amortization 177,719 171,111
Gain on foreign exchange 0 0
Operating income 330,751 329,623
Interest expense 99,063 97,698
Interest, dividend, equity and other income (5,558) (4,208)
Change in value of investment carried at fair value 0  
Other expenses 5,699 6,087
Earnings (loss) before income taxes 231,547 230,046
Property, plant and equipment 4,210,115 4,023,479
Investment carried at fair value 0  
Equity-method investees 959 2,220
Total assets 6,012,641 5,817,599
Capital expenditures 370,221 407,408
Revenue related to alternative revenue programs, not recognized as revenue from contract with customers 7,425  
Liberty Power Group    
Revenue    
Revenue 247,223 231,152
Fuel, power and water purchased 27,164 19,590
Net revenue 220,059 211,562
Operating expenses 70,980 66,851
Administrative expenses 18,539 15,992
Depreciation and amortization 82,044 79,183
Gain on foreign exchange 0 0
Operating income 48,496 49,536
Interest expense 50,920 36,646
Interest, dividend, equity and other income (45,741) (2,871)
Change in value of investment carried at fair value 0  
Other expenses 1,576 1,713
Earnings (loss) before income taxes 41,741 14,048
Property, plant and equipment 2,152,420 2,246,869
Investment carried at fair value 814,530  
Equity-method investees 29,273 29,710
Total assets 3,269,786 2,474,293
Capital expenditures 96,148 157,695
Corporate    
Revenue    
Revenue 0 0
Fuel, power and water purchased 0 0
Net revenue 0 0
Operating expenses 0 0
Administrative expenses 937 611
Depreciation and amortization 1,009 1,020
Gain on foreign exchange (58) 323
Operating income (1,888) (1,954)
Interest expense 2,135 21,478
Interest, dividend, equity and other income (1,840) (2,159)
Change in value of investment carried at fair value 137,957  
Other expenses 687 47,689
Earnings (loss) before income taxes (140,827) (68,962)
Property, plant and equipment 31,023 34,549
Investment carried at fair value 0  
Equity-method investees 260 337
Total assets 106,541 103,675
Capital expenditures $ 0 $ 0