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Derivative Instruments - Derivatives Not Designated as Hedging Instruments by Classification and Amount of Gains and Losses (Detail) - Not Designated As Hedging Instrument - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments | $ (23,400) | $ 70,700 | $ (23,353) | $ 70,711 | $ (9,425)
Foreign currency forward exchange contracts | Other non-operating expense, net |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments |  |  | (23,109) | 70,200 | (11,056)
Foreign currency forward exchange contracts | Cost of sales |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net gain (loss) recognized in the statements of operations for derivatives not designated as hedging instruments |  |  | $ (244) | $ 511 | $ 1,631

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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