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Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities $ 803,994 $ 667,388
Derivatives 7 121
Total including derivatives 1,031,602 1,006,429
Contingent consideration   388
Liabilities   388
Cash
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and Cash equivalents 115,442 139,354
Cash Equivalents
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and Cash equivalents 112,159 199,566
U.S. Treasury Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 382,871 312,116
U.S. Government Agency Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 261,598 217,655
Corporate Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 50,161 55,755
Commercial Paper
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 97,667 70,434
Equity And Debt Mutual Funds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 11,360 9,717
Certificates Of Deposit And Time Deposits
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 257 1,627
Non-U.S. Government Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 80 84
Subtotal
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 1,031,595 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 including derivatives 617,661 644,226
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 115,442 139,354
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 107,988 183,039
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 382,871 312,116
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 11,360 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 617,661 644,226
Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivatives 7 121
Total including derivatives 413,941 362,203
Significant Other Observable Inputs (Level 2) | Cash Equivalents
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and Cash equivalents 4,171 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 261,598 217,655
Significant Other Observable Inputs (Level 2) | Corporate Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 50,161 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 97,667 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 257 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 80 84
Significant Other Observable Inputs (Level 2) | Subtotal
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 413,934 362,082
Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Contingent consideration   388
Liabilities   $ 388