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 ($)	Dec. 31, 2018 USD ($)
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