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Financial instruments - Fair Value of Financial Instruments (Detail)
$ in Thousands, $ in Thousands
Jun. 30, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Level 1      
Fair Value of Financial Instruments [Line Items]      
Long-term investments carried at fair value $ 1,307,814 $ 1,178,581  
Total financial assets 1,307,814   $ 1,178,581
Long-term debt 1,575,663   1,495,153
Convertible debentures 548   623
Total financial liabilities 1,576,211   1,495,776
Level 2      
Fair Value of Financial Instruments [Line Items]      
Long-term investments carried at fair value 26,650 27,072  
Development loans and other receivables 111,274   37,984
Derivative Asset 13,635   16
Total financial assets 151,559   65,072
Long-term debt 3,040,475   2,788,915
Convertible debentures 0    
Derivative financial instruments, liabilities 117,511   83,837
Total financial liabilities 3,172,620   2,887,872
Level 2 | Energy contracts | Not designated as a hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset     0
Level 2 | Commodity contracts for regulatory operations      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 57   16
Derivative financial instruments, liabilities 580   2,072
Level 2 | Cross currency swap | Designated as a hedge | Net Investment Hedging      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 13,578    
Derivative financial instruments, liabilities 106,007   81,765
Level 2 | Interest rate swaps | Designated as a hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative financial instruments, liabilities 10,924    
Level 2 | Series C Preferred Stock      
Fair Value of Financial Instruments [Line Items]      
Preferred shares, Series C 14,634   15,120
Level 3      
Fair Value of Financial Instruments [Line Items]      
Long-term investments carried at fair value 83,060 $ 88,494  
Development loans and other receivables 0   0
Derivative Asset 58,843   85,688
Total financial assets 141,903   174,182
Derivative financial instruments, liabilities 2,090   827
Total financial liabilities 2,090   827
Level 3 | Energy contracts | Designated as a hedge | Cash flow hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 58,383   65,304
Derivative financial instruments, liabilities 2,004   789
Level 3 | Energy contracts | Not designated as a hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 460    
Derivative financial instruments, liabilities 86    
Level 3 | Energy contracts | Not designated as a hedge | Cash flow hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset     20,384
Level 3 | Commodity contracts for regulatory operations      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 0    
Level 3 | Interest rate swaps | Not designated as a hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative financial instruments, liabilities     38
Carrying amount      
Fair Value of Financial Instruments [Line Items]      
Long-term investments carried at fair value 1,417,524   1,294,147
Development loans and other receivables 104,005   37,050
Derivative Asset 72,478   85,704
Total financial assets 1,594,007   1,416,901
Long-term debt 4,154,776   3,931,868
Convertible debentures 314   342
Derivative financial instruments, liabilities 119,601   84,664
Total financial liabilities 4,287,666   4,030,667
Carrying amount | Energy contracts | Designated as a hedge | Cash flow hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 58,383   65,304
Derivative financial instruments, liabilities 2,004   789
Carrying amount | Energy contracts | Not designated as a hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 460    
Derivative financial instruments, liabilities 86    
Carrying amount | Energy contracts | Not designated as a hedge | Cash flow hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset     20,384
Carrying amount | Commodity contracts for regulatory operations      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 57   16
Derivative financial instruments, liabilities 580   2,072
Carrying amount | Cross currency swap | Designated as a hedge | Net Investment Hedging      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 13,578    
Derivative financial instruments, liabilities 106,007   81,765
Carrying amount | Interest rate swaps | Designated as a hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative financial instruments, liabilities 10,924    
Carrying amount | Interest rate swaps | Not designated as a hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative financial instruments, liabilities     38
Carrying amount | Series C Preferred Stock      
Fair Value of Financial Instruments [Line Items]      
Preferred shares, Series C 12,975   13,793
Fair value      
Fair Value of Financial Instruments [Line Items]      
Long-term investments carried at fair value 1,417,524   1,294,147
Development loans and other receivables 111,274   37,984
Derivative Asset 72,478   85,704
Total financial assets 1,601,276   1,417,835
Long-term debt 4,616,138   4,284,068
Convertible debentures 548   623
Derivative financial instruments, liabilities 119,601   84,664
Total financial liabilities 4,750,921   4,384,475
Fair value | Energy contracts | Designated as a hedge | Cash flow hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 58,383   65,304
Derivative financial instruments, liabilities 2,004   789
Fair value | Energy contracts | Not designated as a hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 460    
Derivative financial instruments, liabilities 86    
Fair value | Energy contracts | Not designated as a hedge | Cash flow hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset     20,384
Fair value | Commodity contracts for regulatory operations      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 57   16
Derivative financial instruments, liabilities 580   2,072
Fair value | Cross currency swap | Designated as a hedge | Net Investment Hedging      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset 13,578    
Derivative financial instruments, liabilities 106,007   81,765
Fair value | Interest rate swaps | Designated as a hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative financial instruments, liabilities 10,924    
Fair value | Interest rate swaps | Not designated as a hedge      
Fair Value of Financial Instruments [Line Items]      
Derivative financial instruments, liabilities     38
Fair value | Series C Preferred Stock      
Fair Value of Financial Instruments [Line Items]      
Preferred shares, Series C 14,634   $ 15,120
Intrinsic Value | Commodity contracts for regulatory operations      
Fair Value of Financial Instruments [Line Items]      
Derivative Asset $ 153