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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 29, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |
Money market instruments | $ 225 | $ 5,076
Financial assets at fair value | 408,973 |
Corporate Bonds [Member] |  |
Assets: |  |
Financial assets at fair value | 210,341 |
Asset-Backed Securities [Member] |  |
Assets: |  |
Financial assets at fair value | 69,928 |
Treasury Bills [Member] |  |
Assets: |  |
Financial assets at fair value | 69,277 |
Sovereign Bonds [Member] |  |
Assets: |  |
Financial assets at fair value | 29,923 |
Municipal Bonds [Member] |  |
Assets: |  |
Financial assets at fair value | 28,005 |
Agency Bonds [Member] |  |
Assets: |  |
Financial assets at fair value | 1,499 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Corporate stock | 1,864 |
Money market instruments | 225 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] |  |
Assets: |  |
Financial assets at fair value | 210,341 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member] |  |
Assets: |  |
Financial assets at fair value | 69,928 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Treasury Bills [Member] |  |
Assets: |  |
Financial assets at fair value | 69,277 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Sovereign Bonds [Member] |  |
Assets: |  |
Financial assets at fair value | 29,923 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Bonds [Member] |  |
Assets: |  |
Financial assets at fair value | 28,005 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Agency Bonds [Member] |  |
Assets: |  |
Financial assets at fair value | 1,499 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Currency Forward Contracts [Member] |  |
Assets: |  |
Currency forward contracts | 81 |
Liabilities: |  |
Currency forward contracts | $ 64 |

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- Definition Corporate stock fair value disclosure. + References No definition available. + Details
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- Definition Amount of debt 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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + 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 Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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