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Financial instruments - Effects on Statement of Operations of Derivative Financial Instruments Not Designated as Hedges (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Fair Value of Financial Instruments [Line Items] |  |
Total unrealized gain (loss) on derivative financial instruments | $ 15,502 | $ (2,462)
Gain on derivative financial instruments | 4,564 | 4,408
Renewable energy sales | (5,432) | 5,236
Reduction to gain on sale of renewable assets | 0 | (7,185)
Gain (loss) on derivative instruments | (868) | 2,459
Not Designated as Hedging Instrument |  |
Fair Value of Financial Instruments [Line Items] |  |
Total unrealized gain (loss) on derivative financial instruments | 39 | (760)
Total realized loss on derivative financial instruments | (4,896) | (246)
Loss on derivative financial instruments not accounted for as hedges | (4,857) | (1,006)
Amortization of AOCI gains frozen as a result of hedge dedesignation | 3,989 | 3,465
Not Designated as Hedging Instrument | Energy derivative contracts |  |
Fair Value of Financial Instruments [Line Items] |  |
Total unrealized gain (loss) on derivative financial instruments | (372) | (945)
Total realized loss on derivative financial instruments | (4,896) | 6,939
Not Designated as Hedging Instrument | Commodity contracts |  |
Fair Value of Financial Instruments [Line Items] |  |
Total unrealized gain (loss) on derivative financial instruments | 411 | 185
Not Designated as Hedging Instrument | Interest rate forwards |  |
Fair Value of Financial Instruments [Line Items] |  |
Total realized loss on derivative financial instruments | $ 0 | $ (7,185)

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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 Gain (Loss) on Sale of Renewable Assets + References No definition available. + Details
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- Definition Gain (Loss) Renewable Energy Sales + 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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