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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 |  |

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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