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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
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Fair Value of Financial Instruments [Line Items] |  |  |  |
Total change in unrealized gain (loss) on derivative financial instruments | $ 1,940 | $ (9,144) | $ 2,179 | $ (9,675)
Total realized gain (loss) on derivative financial instruments | 0 | 433 | 0 | 156
Gain on derivative financial instruments | 1,389 | 409 | 1,446 | 213
Gain (loss) on derivative instruments | 1,389 | 842 | 1,446 | 369
Not Designated as Hedging Instrument |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Total change in unrealized gain (loss) on derivative financial instruments | 449 | 543 | 627 | (19)
Total realized gain (loss) on derivative financial instruments | (549) | 288 | (681) | 366
Gain (loss) on derivative financial instruments not accounted for as hedges | (100) | 831 | (54) | 347
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 | 449 | 398 | 627 | 398
Total realized gain (loss) on derivative financial instruments | (549) | 0 | (681) | (207)
Not Designated as Hedging Instrument | Foreign exchange forward |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Total change in unrealized gain (loss) on derivative financial instruments | 0 | 145 | 0 | (417)
Total realized gain (loss) on derivative financial instruments | 0 | 288 | 0 | 573
Designated as Hedging Instrument |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Amortization of AOCI gains frozen as a result of hedge dedesignation | $ 1,489 | $ 11 | $ 1,500 | $ 22

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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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + 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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition Gain (loss) incurred in hedging activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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