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Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Fair Value Measurements [Line Items] |  |
Maturity period limit of foreign currency exchange instruments (in months) | 3 months |
Foreign Exchange Forward Contract |  |
Fair Value Measurements [Line Items] |  |
Notional amount of foreign exchange forward contracts not designated as hedging instruments | $ 557.0 | $ 514.0

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 + Details
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- Details
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