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Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Derivatives |  | $ 121
Available for sale securities | 651,034 | 667,388
Total | 956,253 | 1,006,429
Contingent consideration | 75 | 388
Derivatives | 475 |
Liabilities | 550 | 388
Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and Cash equivalents | 118,176 | 139,354
Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and Cash equivalents | 187,043 | 199,566
U.S. Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 315,107 | 312,116
U.S. Government Agency Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 211,341 | 217,655
Corporate Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 47,704 | 55,755
Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 65,349 | 70,434
Equity And Debt Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 11,189 | 9,717
Certificates Of Deposit And Time Deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 259 | 1,627
Non-U.S. Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 85 | 84
Subtotal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities |  | 1,006,308
Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total | 624,270 | 644,226
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and Cash equivalents | 118,176 | 139,354
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and Cash equivalents | 179,798 | 183,039
Quoted Prices in Active Markets for Identical Instruments (Level 1) | U.S. Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 315,107 | 312,116
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Equity And Debt Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 11,189 | 9,717
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Subtotal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities |  | 644,226
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Derivatives |  | 121
Total | 331,983 | 362,203
Derivatives | 475 |
Liabilities | 475 |
Significant Other Observable Inputs (Level 2) | Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and Cash equivalents | 7,245 | 16,527
Significant Other Observable Inputs (Level 2) | U.S. Government Agency Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 211,341 | 217,655
Significant Other Observable Inputs (Level 2) | Corporate Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 47,704 | 55,755
Significant Other Observable Inputs (Level 2) | Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 65,349 | 70,434
Significant Other Observable Inputs (Level 2) | Certificates Of Deposit And Time Deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 259 | 1,627
Significant Other Observable Inputs (Level 2) | Non-U.S. Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 85 | 84
Significant Other Observable Inputs (Level 2) | Subtotal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities |  | 362,082
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Contingent consideration | 75 | 388
Liabilities | $ 75 | $ 388

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + 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=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 65 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6910684&loc=d3e4570-128470 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(3),(c)(1) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6411-128476 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 25 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=6946367&loc=d3e3629-128468 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 25 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6946367&loc=d3e3642-128468 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 29, 30, 41, 42, 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 30 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=18499824&loc=d3e4243-128469 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 30 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=18499824&loc=d3e4237-128469 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 40 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6910732&loc=d3e4805-128471 + Details
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