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Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Foreign exchange contracts [Member]
Derivative [Line Items]
Notional amount of foreign currency derivative hedges	$ 349,700,000		$ 349,700,000
Cash flow hedge [Member]
Derivative [Line Items]
Derivative instrument gain (loss)	(300,000)	$ 2,900,000	(7,000,000.0)	$ 2,700,000
Cash flow hedge [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Estimated amount of net derivative losses in accumulated other comprehensive income reclassified to earnings within 12 months	$ 2,400,000		$ 2,400,000

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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
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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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