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Financial instruments - Effects on Statement of Operations of Derivative Financial Instruments Not Designated as Hedges (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Fair Value of Financial Instruments [Line Items] |  |  |  |
Unrealized gain (loss) on derivative financial instruments: | $ 4,882 | $ 334 | $ 9,851 | $ 402
Gain (loss) on derivative instruments | (456) | (6,135) | (646) | (5,884)
Gain (loss) on derivative financial instruments | 1,039 | (3,313) | 3,205 | (2,569)
Non-regulated energy sales | (1,495) | (2,822) | (3,851) | (3,315)
Not Designated as Hedging Instrument |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Unrealized gain (loss) on derivative financial instruments: | 84 | (7,032) | 1,190 | (7,783)
Total realized gain (loss) on derivative financial instruments | (1,537) | (157) | (3,830) | 149
Loss on derivative financial instruments not accounted for as hedges | (1,453) | (7,189) | (2,640) | (7,634)
Amortization of AOCI gains frozen as a result of hedge dedesignation | 997 | 1,054 | 1,994 | 1,750
Not Designated as Hedging Instrument | Interest rate swaps designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Unrealized gain (loss) on derivative financial instruments: | 0 | (4,680) | 0 | (4,680)
Not Designated as Hedging Instrument | Energy derivative contracts |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Unrealized gain (loss) on derivative financial instruments: | 84 | (2,352) | 62 | (3,103)
Total realized gain (loss) on derivative financial instruments | (1,537) | (157) | (3,830) | 149
Not Designated as Hedging Instrument | Commodity contracts |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Unrealized gain (loss) on derivative financial instruments: | $ 0 | $ 0 | $ 1,128 | $ 0

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- Definition Derivative Instruments, Gain (Loss) Frozen due to Hedge Designation + References No definition available. + Details
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- Definition Fair Value of Financial Instruments [Line Items] + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4CC + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(c)(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(c)(5)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(c)(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)(c)(7)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5A -Subparagraph (SX 210.12-13A(Column F)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5A + Details
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