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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, 2019	Dec. 31, 2018
Fair Value of Financial Instruments [Line Items]
Total change in unrealized loss (gain) on derivative financial instruments	$ (15,237)	$ (1,781)
Total realized loss on derivative financial instruments	757	(1,115)
Discontinued hedge accounting (note 24(b)(ii)) and other	33	33
Loss (gain) on derivative financial instruments	(16,113)	636
Gain (loss) on derivative instruments	(15,356)	(479)
Not Designated as Hedging Instrument
Fair Value of Financial Instruments [Line Items]
Total change in unrealized loss (gain) on derivative financial instruments	374	(1,153)
Total realized loss on derivative financial instruments	80	42
Loss (gain) on derivative financial instruments not accounted for as hedges	454	(1,111)
Not Designated as Hedging Instrument | Energy derivative contracts
Fair Value of Financial Instruments [Line Items]
Total change in unrealized loss (gain) on derivative financial instruments	(530)	77
Total realized loss on derivative financial instruments	227	(73)
Not Designated as Hedging Instrument | Foreign exchange forward
Fair Value of Financial Instruments [Line Items]
Total change in unrealized loss (gain) on derivative financial instruments	904	(1,230)
Total realized loss on derivative financial instruments	(147)	115
Designated as Hedging Instrument
Fair Value of Financial Instruments [Line Items]
Discontinued hedge accounting (note 24(b)(ii)) and other	$ (15,810)	$ 632

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Fair Value of Financial Instruments [Line Items]

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No definition available.

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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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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