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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Fair Value of Financial Instruments [Line Items]
Total change in unrealized gain (loss) on derivative financial instruments	$ (1,141)	$ 1,940	$ (198)	$ 2,179
Gain (loss) on derivative instruments	(1,354)	1,389	(265)	1,446
Gain on derivative financial instruments	(1,354)	1,389	(265)	1,446
Not Designated as Hedging Instrument
Fair Value of Financial Instruments [Line Items]
Total change in unrealized gain (loss) on derivative financial instruments	(2,305)	449	(2,627)	627
Total realized gain (loss) on derivative financial instruments	196	(549)	359	(681)
Gain (loss) on derivative financial instruments not accounted for as hedges	(2,109)	(100)	(2,268)	(54)
Not Designated as Hedging Instrument | Energy derivative contracts
Fair Value of Financial Instruments [Line Items]
Total change in unrealized gain (loss) on derivative financial instruments	(2,305)	449	(2,627)	627
Total realized gain (loss) on derivative financial instruments	196	(549)	359	(681)
Designated as Hedging Instrument
Fair Value of Financial Instruments [Line Items]
Amortization of AOCI gains frozen as a result of hedge dedesignation	$ 755	$ 1,489	$ 2,003	$ 1,500

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- Definition

Derivative Instruments, Gain (Loss) Frozen due to Hedge Designation

+ References

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Fair Value of Financial Instruments [Line Items]

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Gain (loss) incurred in hedging activities.

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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.

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