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Financial instruments - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) Financial_Institution_Counterparty | Dec. 31, 2018 USD ($) Financial_Institution_Counterparty | Dec. 31, 2019 EUR (€) Financial_Institution_Counterparty | Dec. 31, 2018 EUR (€) Financial_Institution_Counterparty
Derivatives Fair Value [Line Items] |  |  |  |  |
Foreign currency translation, continuing operations, adjustment gain (loss), net of tax | $ 59,758,000 | $ 4,195,000 | $ (83,889,000) |  |
Interest benefit on swaps not designed as hedging instrument | 19,178,000 | 18,866,000 | 3,277,000 |  |
Cash Flow Hedging |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Ineffectiveness on hedging derivatives | 0 | 0 | 0 |  |
Cross Currency Interest Rate Contract | Cash Flow Hedging |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Foreign currency translation, continuing operations, adjustment gain (loss), net of tax | (37,300,000) | 20,800,000 |  |  |
Not Designated as Hedging Instrument | Foreign Currency Exchange Contracts |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Loss on derivative | 1,800,000 | 3,800,000 |  |  |
Total notional amount for all open foreign currency forward contracts | 163,500,000 | 145,100,000 |  |  |
Not Designated as Hedging Instrument | Cross Currency Interest Rate Contract |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Interest benefit on swaps not designed as hedging instrument | 14,500,000 | 18,900,000 |  |  |
Designated as Hedging Instrument | Foreign Currency Exchange Contracts | Cash Flow Hedging |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Total notional amount for all open foreign currency forward contracts | $ 129,500,000 | 132,000,000.0 |  |  |
Designated as Hedging Instrument | Cross Currency Interest Rate Contract |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |
Total notional amount for all open foreign currency forward contracts |  | $ 250,000,000 | $ 500,000,000 | € 219,200,000 | € 433,900,000
Derivative, number of instruments held | Financial_Institution_Counterparty |  | 5 | 6 | 5 | 6
Derivative, fixed interest rate |  | 4.875% | 4.625% | 4.875% | 4.625%
Derivative, annual interest rate |  | 2.4595% | 1.942% | 2.4595% | 1.942%

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- Definition Amount of gain (loss) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121577181&loc=SL110061172-113977 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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