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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
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)