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Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |
Foreign exchange contracts | $ 65 | $ 216
Total assets | 80,568 | 69,559
Liabilities: |  |
Foreign exchange contracts | 6 | 112
Total liabilities | 6 | 112
Foreign government bond |  |
Assets: |  |
Marketable securities |  | 575
Corporate bonds |  |
Assets: |  |
Marketable securities | 80,503 | 66,809
Certificates of Deposit |  |
Assets: |  |
Marketable securities |  | 1,959
Level I |  |
Assets: |  |
Foreign exchange contracts |  |
Total assets |  |
Liabilities: |  |
Foreign exchange contracts |  |
Total liabilities |  |
Level I | Foreign government bond |  |
Assets: |  |
Marketable securities |  |
Level I | Corporate bonds |  |
Assets: |  |
Marketable securities |  |
Level I | Certificates of Deposit |  |
Assets: |  |
Marketable securities |  |
Level II |  |
Assets: |  |
Foreign exchange contracts | 65 | 216
Total assets | 80,568 | 69,559
Liabilities: |  |
Foreign exchange contracts | 6 | 112
Total liabilities | 6 | 112
Level II | Foreign government bond |  |
Assets: |  |
Marketable securities |  | 575
Level II | Corporate bonds |  |
Assets: |  |
Marketable securities | 80,503 | 66,809
Level II | Certificates of Deposit |  |
Assets: |  |
Marketable securities |  | 1,959
Level III |  |
Assets: |  |
Foreign exchange contracts |  |
Total assets |  |
Liabilities: |  |
Foreign exchange contracts |  |
Total liabilities |  |
Level III | Foreign government bond |  |
Assets: |  |
Marketable securities |  |
Level III | Corporate bonds |  |
Assets: |  |
Marketable securities |  |
Level III | Certificates of Deposit |  |
Assets: |  |
Marketable securities |  |

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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=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + Details
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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References No definition available. + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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=25499696&loc=d3e19207-110258 + Details
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