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Segmented information - Results of Operations and Assets for Segments (Detail)
$ in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
CAD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
CAD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
business_unit
Dec. 31, 2017
business_unit
Segment Reporting Information [Line Items]                
Number of business units | business_unit             2 2
Number of segments | segment         2      
Revenue                
Revenue   $ 343,578   $ 366,143 $ 820,803 $ 860,357    
Fuel, power and water purchased   76,127   93,592 233,654 265,882    
Net revenue   267,451   272,551 587,149 594,475    
Operating expenses   120,187   120,262 240,300 241,384    
Administrative expenses   13,524   13,563 26,642 26,147    
Depreciation and amortization   69,813   64,781 140,860 133,430    
Loss on foreign exchange   1,467   (1,272) 934 (1,071)    
Operating income   62,460   75,217 178,413 194,585    
Interest expense   45,840   38,429 88,461 73,929    
Interest, dividend, equity and other income   (39,268)   (10,892) (64,558) (21,553)    
Change in value of investments carried at fair value (note 6)   (121,394)   (15,033) (115,576) 101,971    
Other   9,141   1,247 13,194 7,530    
Earnings before income taxes   168,141   61,466 256,892 32,708    
Capital expenditures   105,664 $ 83,096   213,050 241,270    
Property, plant and equipment   6,811,277   6,811,277 6,811,277 6,811,277 $ 6,393,558  
Investments carried at fair value   1,097,661   1,097,661 1,097,661 1,097,661 814,530  
Equity-method investees   50,486   50,486 50,486 50,486 30,492  
Total assets   10,034,328   10,034,328 10,034,328 10,034,328 9,388,968  
Revenue related to hedging gains   5,200   5 11,640 13,230    
Revenue related to alternative revenue programs   3,460   5 (4) 5,970    
Liberty Utilities Group                
Revenue                
Revenue   281,607   309,930 692,631 733,588    
Fuel, power and water purchased   73,469   89,069 224,075 252,428    
Net revenue   208,138   220,861 468,556 481,160    
Operating expenses   102,021   101,514 203,996 203,988    
Administrative expenses   6,546   9,212 11,979 18,057    
Depreciation and amortization   47,034   44,740 95,451 89,484    
Loss on foreign exchange   0   0 0 0    
Operating income   52,537   65,395 157,130 169,631    
Interest expense   26,057   24,767 51,149 49,971    
Interest, dividend, equity and other income   (1,854)   (1,360) (3,111) (2,760)    
Change in value of investments carried at fair value (note 6)   0   0 0 0    
Other   8,796   346 10,756 (1,074)    
Earnings before income taxes   19,538   41,642 98,336 123,494    
Capital expenditures   104,758   72,544 202,173 168,733    
Property, plant and equipment       4,315,669   4,315,669 4,210,115  
Investments carried at fair value       0   0 0  
Equity-method investees       28,149   28,149 959  
Total assets       6,070,178   6,070,178 6,012,641  
Liberty Power Group                
Revenue                
Revenue   61,971   56,213 128,172 126,769    
Fuel, power and water purchased   2,658   4,523 9,579 13,454    
Net revenue   59,313   51,690 118,593 113,315    
Operating expenses   18,166   18,748 36,304 37,396    
Administrative expenses   7,335   4,166 14,889 7,745    
Depreciation and amortization   22,536   19,790 44,921 43,433    
Loss on foreign exchange   0   0 0 0    
Operating income   11,276   8,986 22,479 24,741    
Interest expense   16,237   13,127 32,444 22,867    
Interest, dividend, equity and other income   (37,050)   (8,915) (60,547) (17,676)    
Change in value of investments carried at fair value (note 6)   0   0 0 0    
Other   (77)   (157) 73 (40)    
Earnings before income taxes   32,166   4,931 50,509 19,590    
Capital expenditures $ 906     10,552 10,877 72,537    
Property, plant and equipment       2,462,792   2,462,792 2,152,420  
Investments carried at fair value       1,097,661   1,097,661 814,530  
Equity-method investees       22,066   22,066 29,273  
Total assets       3,844,668   3,844,668 3,269,786  
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   (357)   185 (226) 345    
Depreciation and amortization   243   251 488 513    
Loss on foreign exchange   1,467   (1,272) 934 (1,071)    
Operating income   (1,353)   836 (1,196) 213    
Interest expense   3,546   535 4,868 1,091    
Interest, dividend, equity and other income   (364)   (617) (900) (1,117)    
Change in value of investments carried at fair value (note 6)   (121,394)   (15,033) (115,576) 101,971    
Other   422   1,058 2,365 8,644    
Earnings before income taxes   116,437   14,893 108,047 (110,376)    
Capital expenditures   $ 0   0 $ 0 0    
Property, plant and equipment       32,816   32,816 31,023  
Investments carried at fair value       0   0 0  
Equity-method investees       271   271 260  
Total assets       $ 119,482   $ 119,482 $ 106,541