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Derivatives - Summary of Primary Net Hedging Positions and Corresponding Fair Values (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	$ 154,674	$ 159,394
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(185)	1,317
Forward Exchange Contracts [Member] | U.S. Dollar/Japanese Yen [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	45,899	43,770
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	43	(478)
Forward Exchange Contracts [Member] | U.S. Dollar/South Korean Won [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	51,733	59,149
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	167	570
Forward Exchange Contracts [Member] | U.S. Dollar/Euro [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	15,670	23,515
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	221	688
Forward Exchange Contracts [Member] | U.S. Dollar/U.K. Pound Sterling [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	8,279	11,827
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	(166)	323
Forward Exchange Contracts [Member] | U.S. Dollar/Taiwan Dollar [Member]
Derivative [Line Items]
Currency Hedged (Buy/Sell), Gross Notional Value, Net	33,093	21,133
Currency Hedged (Buy/Sell), Fair Value, (Liability)/Asset, Net	$ (450)	$ 214

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow hedging instruments.

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