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Financial instruments - Effects on Statement of Operations of Derivative Financial Instruments Not Designated as Hedges (Detail) $ in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 CAD ($)	Jun. 30, 2018 USD ($)
Fair Value of Financial Instruments [Line Items]
Total change in unrealized loss (gain) on derivative financial instruments	$ 9,144	$ (5,059)	$ 9,675		$ (2,183)
Total realized loss (gain) on derivative financial instruments	(434)	(276)	(157)	$ (204)
Other	8	8	16		16
Loss (gain) on derivative financial instruments	(409)	55	(213)	172	$ 172
Gain (loss) on derivative instruments	(843)	(221)	(370)	(32)
Not Designated as Hedging Instrument
Fair Value of Financial Instruments [Line Items]
Total change in unrealized loss (gain) on derivative financial instruments	(543)	(661)	19	(881)
Total realized loss (gain) on derivative financial instruments	(288)	452	(366)	872
Gain on derivative financial instruments not accounted for as hedges	(831)	(209)	(347)	(9)
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	(398)	67	(398)	182
Total realized loss (gain) on derivative financial instruments	0	0	207	13
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	(145)	(728)	417	(1,063)
Total realized loss (gain) on derivative financial instruments	(288)	452	(573)	859
Designated as Hedging Instrument
Fair Value of Financial Instruments [Line Items]
Other	$ (12)	$ (12)	$ (23)	$ (23)

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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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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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