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Derivative Instruments - Outstanding Forward Contracts Table (Detail) - Not Designated as Hedging Instrument ₩ in Thousands, ¥ in Thousands, £ in Thousands, Ft in Thousands, $ in Thousands, $ in Thousands, $ in Thousands | Mar. 31, 2019 HUF (Ft) | Mar. 31, 2019 GBP (£) | Mar. 31, 2019 SGD ($) | Mar. 31, 2019 JPY (¥) | Mar. 31, 2019 KRW (₩) | Mar. 31, 2019 TWD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 HUF (Ft) | Dec. 31, 2018 GBP (£) | Dec. 31, 2018 SGD ($) | 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 |  |  |  | ¥ 20,000 |  |  | $ 22,514 |  |  |  | ¥ 23,000 |  |  | $ 26,330
Japanese Yen |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  |  |  | ¥ 500,000 |  |  | 4,526 |  |  |  | ¥ 380,000 |  |  | 3,459
British Pound |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  | £ 2,100 |  |  |  |  | 2,747 |  | £ 2,500 |  |  |  |  | 3,204
Hungarian Forint |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts | Ft 810,000 |  |  |  |  |  | 2,840 | Ft 750,000 |  |  |  |  |  | 2,685
Taiwanese Dollar |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  |  |  |  |  | $ 54,200 | 1,761 |  |  |  |  |  | $ 55,000 | 1,807
Korean Won |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  |  |  |  | ₩ 3,350,000 |  | 2,954 |  |  |  |  | ₩ 3,125,000 |  | 2,808
Canada, Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  |  |  |  |  | $ 930 | 697 |  |  |  |  |  | $ 990 | 726
Singapore, Dollars |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding forward contracts |  |  | $ 500 |  |  |  | $ 369 |  |  | $ 700 |  |  |  | $ 514

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