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Financial Derivatives and Hedging Activities - Fair Values of Derivative Instruments (Detail) - Forward Foreign Currency Exchange Contracts [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives Fair Value [Line Items] |  |
Derivative asset, fair value | $ 1,489 | $ 1,066
Designated as Hedging [Member] | Other Current Liabilities [Member] |  |
Derivatives Fair Value [Line Items] |  |
Derivative liability, fair value | 522 | 4,787
Not Designated as Hedging [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives Fair Value [Line Items] |  |
Derivative asset, fair value | 203 | 151
Not Designated as Hedging [Member] | Other Current Liabilities [Member] |  |
Derivatives Fair Value [Line Items] |  |
Derivative liability, fair value | $ 309 | $ 43

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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226006-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 + Details
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