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Derivatives and Hedging Instruments - Summary of Effects of Derivatives on Cash Flow Hedging Relationships in Company's Statements of Income, Derivatives Designated as Hedging Instruments (Detail) - Cash Flow Hedges - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Foreign currency exchange contracts |  |
Derivative [Line Items] |  |
Gain or (Loss) Recognized in OCI- Effective Portion | $ 2,302 | $ 1,404
Foreign currency exchange contracts | Salaries and employee benefits |  |
Derivative [Line Items] |  |
Gain or (Loss) Reclassified from OCI into Income - Effective Portion | 1,280 | 755
Foreign currency exchange contracts | Other (expense) income |  |
Derivative [Line Items] |  |
Amount of Gain or (Loss) Recognized - Ineffective Portion and Amount Excluded from Effectiveness Testing | 0 | 0
Foreign currency exchange contracts |  |
Derivative [Line Items] |  |
Gain or (Loss) Recognized in OCI- Effective Portion | 310 | (5)
Foreign currency exchange contracts | General and administrative expenses |  |
Derivative [Line Items] |  |
Gain or (Loss) Reclassified from OCI into Income - Effective Portion | 76 | 105
Foreign currency exchange contracts | Other (expense) income |  |
Derivative [Line Items] |  |
Amount of Gain or (Loss) Recognized - Ineffective Portion and Amount Excluded from Effectiveness Testing | 0 | 0
Interest rate swap agreements |  |
Derivative [Line Items] |  |
Gain or (Loss) Recognized in OCI- Effective Portion | 9 | (131)
Interest rate swap agreements | Interest expense |  |
Derivative [Line Items] |  |
Gain or (Loss) Reclassified from OCI into Income - Effective Portion | 110 | 0
Interest rate swap agreements | Other (expense) income |  |
Derivative [Line Items] |  |
Amount of Gain or (Loss) Recognized - Ineffective Portion and Amount Excluded from Effectiveness Testing | $ 0 | $ 0

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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