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Derivative Instruments - Outstanding Forward Contracts Table (Detail) - Not Designated as Hedging Instrument € in Thousands, ₩ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands | Jun. 30, 2019 EUR (€) | Jun. 30, 2019 CAD ($) | Jun. 30, 2019 SGD ($) | Jun. 30, 2019 JPY (¥) | Jun. 30, 2019 KRW (₩) | Jun. 30, 2019 TWD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 SGD ($) | Dec. 31, 2018 JPY (¥) | Dec. 31, 2018 KRW (₩) | Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($)
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Euro Member Countries, Euro |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts | € 19,000 |  |  |  |  |  | $ 21,681 | € 23,000 |  |  |  |  |  | $ 26,330
Japanese Yen |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  |  |  | ¥ 400,000 |  |  | 3,717 |  |  |  | ¥ 380,000 |  |  | 3,459
United Kingdom, Pounds |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  |  |  | 2,400 |  |  | 3,055 |  |  |  | 2,500 |  |  | 3,204
Hungary, Forint |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  |  |  | ¥ 900,000 |  |  | 3,178 |  |  |  | ¥ 750,000 |  |  | 2,685
Korean Won |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  |  |  |  | ₩ 3,550,000 |  | 3,072 |  |  |  |  | ₩ 3,125,000 |  | 2,808
Taiwanese Dollar |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  |  |  |  |  | $ 50,000 | 1,617 |  |  |  |  |  | $ 55,000 | 1,807
Canada, Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  | $ 1,100 |  |  |  |  | 841 |  | $ 990 |  |  |  |  | 726
Singapore, Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  |  | $ 0 |  |  |  | $ 0 |  |  | $ 700 |  |  |  | $ 514

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