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Financial instruments - Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value of Financial Instruments [Line Items] |  |
Note payable to related party | $ 0 | $ 30,493
Level 1 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,824,899 | 1,708,683
Total financial assets | 1,824,899 | 1,708,683
Long-term debt | 2,488,347 | 2,316,586
Convertible debentures | 433 | 623
Total financial liabilities | 2,488,780 | 2,317,209
Level 2 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 0 | 20,015
Development loans and other receivables | 9,299 | 31,088
Derivative Asset | 8,488 | 194
Total financial assets | 17,787 | 51,297
Long-term debt | 4,586,832 | 2,823,473
Note payable to related party |  | 30,493
Convertible debentures | 0 |
Derivative financial instruments, liabilities | 64,844 | 104,481
Total financial liabilities | 4,666,887 | 2,974,012
Level 2 | Interest rate swaps | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 2,365 |
Derivative financial instruments, liabilities | 9,124 | 19,649
Level 2 | Commodity contracts for regulatory operations |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 2,406 | 194
Derivative financial instruments, liabilities |  | 614
Level 2 | Cross currency swap |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 3,717 |
Level 2 | Cross currency swap | Designated as a hedge | Net Investment Hedging |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative financial instruments, liabilities | 55,720 | 84,218
Level 2 | Series C Preferred Stock |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C | 15,211 | 15,565
Level 3 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 104,229 | 110,514
Development loans and other receivables | 0 | 0
Derivative Asset | 23,773 | 51,913
Total financial assets | 128,002 | 162,427
Derivative financial instruments, liabilities | 17,911 | 5,929
Total financial liabilities | 17,911 | 5,929
Level 3 | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 23,494 | 51,525
Derivative financial instruments, liabilities | 15,384 | 5,597
Level 3 | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 279 |
Derivative financial instruments, liabilities | 2,527 |
Level 3 | Energy contracts | Not designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset |  | 388
Derivative financial instruments, liabilities |  | 332
Level 3 | Commodity contracts for regulatory operations |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 0 |
Carrying amount |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,929,128 | 1,839,212
Development loans and other receivables | 7,962 | 23,804
Derivative Asset | 32,261 | 52,107
Total financial assets | 1,969,351 | 1,915,123
Long-term debt | 6,622,363 | 4,538,470
Note payable to related party |  | 30,493
Convertible debentures | 285 | 295
Derivative financial instruments, liabilities | 82,755 | 110,410
Total financial liabilities | 6,719,271 | 4,693,366
Carrying amount | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 23,494 | 51,525
Derivative financial instruments, liabilities | 15,384 | 5,597
Carrying amount | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 279 |
Derivative financial instruments, liabilities | 2,527 |
Carrying amount | Energy contracts | Not designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset |  | 388
Derivative financial instruments, liabilities |  | 332
Carrying amount | Interest rate swaps | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 2,365 |
Derivative financial instruments, liabilities | 9,124 | 19,649
Carrying amount | Commodity contracts for regulatory operations |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 2,406 | 194
Derivative financial instruments, liabilities |  | 614
Carrying amount | Cross currency swap |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 3,717 |
Carrying amount | Cross currency swap | Designated as a hedge | Net Investment Hedging |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative financial instruments, liabilities | 55,720 | 84,218
Carrying amount | Series C Preferred Stock |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C | 13,868 | 13,698
Fair value |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,929,128 | 1,839,212
Development loans and other receivables | 9,299 | 31,088
Derivative Asset | 32,261 | 52,107
Total financial assets | 1,970,688 | 1,922,407
Long-term debt | 7,075,179 | 5,140,059
Note payable to related party |  | 30,493
Convertible debentures | 433 | 623
Derivative financial instruments, liabilities | 82,755 | 110,410
Total financial liabilities | 7,173,578 | 5,297,150
Fair value | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 23,494 | 51,525
Derivative financial instruments, liabilities | 15,384 | 5,597
Fair value | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 279 |
Derivative financial instruments, liabilities | 2,527 |
Fair value | Energy contracts | Not designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset |  | 388
Derivative financial instruments, liabilities |  | 332
Fair value | Interest rate swaps | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 2,365 |
Derivative financial instruments, liabilities | 9,124 | 19,649
Fair value | Commodity contracts for regulatory operations |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 2,406 | 194
Derivative financial instruments, liabilities |  | 614
Fair value | Cross currency swap |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative Asset | 3,717 |
Fair value | Cross currency swap | Designated as a hedge | Net Investment Hedging |  |
Fair Value of Financial Instruments [Line Items] |  |
Derivative financial instruments, liabilities | 55,720 | 84,218
Fair value | Series C Preferred Stock |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C | $ 15,211 | $ 15,565

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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://www.xbrl.org/2003/role/disclosureRef -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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: 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=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -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://www.xbrl.org/2003/role/disclosureRef -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 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: 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=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + 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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