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Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Mutual fund assets | $ 20,910 | $ 20,217
Derivative assets: |  |
Foreign currency contracts | 112 | 73
Total assets at fair value | 21,022 | 20,290
Derivative liabilities: |  |
Foreign currency contracts | 305 | 628
Interest rate contracts | 53 |
Total liabilities at fair value | 358 |
Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Mutual fund assets | 20,910 | 20,217
Derivative assets: |  |
Total assets at fair value | 20,910 | 20,217
Level 2 [Member] |  |
Derivative assets: |  |
Foreign currency contracts | 112 | 73
Total assets at fair value | 112 | 73
Derivative liabilities: |  |
Foreign currency contracts | 305 | $ 628
Interest rate contracts | 53 |
Total liabilities at fair value | $ 358 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow 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 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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