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Financial Instruments - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Foreign exchange contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of foreign currency derivative hedges | $ 443,700,000 |  | $ 443,700,000 |
Cash flow hedge [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instrument gain (loss) | 1,400,000 | $ (200,000) | (600,000) | $ (6,700,000)
Cash flow hedge [Member] | Foreign exchange contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Estimated amount of net derivative gains in accumulated other comprehensive income reclassified to earnings within 12 months | $ 1,200,000 |  | $ 1,200,000 |

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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