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Financial Instruments - Derivative Instruments Notional Amount Outstanding (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Forward Currency Contracts [Member] |  |
Schedule Of Information By Major Category Of Credit Derivatives Contracts [Line Items] |  |
Derivative instruments outstanding | $ 473,600 | $ 585,581
Currency Swap [Member] |  |
Schedule Of Information By Major Category Of Credit Derivatives Contracts [Line Items] |  |
Derivative instruments outstanding | $ 600,000 | $ 600,000

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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