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Derivative Instruments and Hedging Activities - Carrying Values of Derivative Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative [Line Items] |  |  |
Derivative Net Carrying Value |  | $ (426) | $ 298
Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Derivative Net Carrying Value |  | (426) | 298
Designated as Hedging Instrument | Foreign currency contracts |  |  |
Derivative [Line Items] |  |  |
Derivative Net Carrying Value | [1] | (426) | 298
Prepaid Expenses And Other Current Assets |  |  |
Derivative [Line Items] |  |  |
Fair Value— Assets |  | 621 | 2,128
Prepaid Expenses And Other Current Assets | Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Fair Value— Assets |  | 621 | 2,128
Prepaid Expenses And Other Current Assets | Designated as Hedging Instrument | Foreign currency contracts |  |  |
Derivative [Line Items] |  |  |
Fair Value— Assets | [1] | 621 | 2,128
Other Current Liabilities |  |  |
Derivative [Line Items] |  |  |
Fair Value— (Liabilities) |  | (1,047) | (1,830)
Other Current Liabilities | Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Fair Value— (Liabilities) |  | (1,047) | (1,830)
Other Current Liabilities | Designated as Hedging Instrument | Foreign currency contracts |  |  |
Derivative [Line Items] |  |  |
Fair Value— (Liabilities) | [1] | $ (1,047) | $ (1,830)
[1] | Assets are included in prepaid expenses and other and liabilities are included in other accrued expenses on the accompanying consolidated balance sheets.

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- Definition Fair value, before effects of master netting arrangements, of a 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 + Details
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