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Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities $ 857,960 $ 667,388
Derivatives 153 121
Total including derivatives 1,199,751 1,006,429
Contingent consideration 2,230 388
Liabilities 2,230 388
Cash
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and Cash equivalents 117,242 139,354
Cash Equivalents
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and Cash equivalents 224,396 199,566
U.S. Treasury Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 467,895 312,116
U.S. Government Agency Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 202,588 217,655
Commercial Paper
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 105,598 70,434
Corporate Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 65,387 55,755
Equity And Debt Mutual Funds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 13,156 9,717
Certificates Of Deposit And Time Deposits
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 3,258 1,627
Non-U.S. Government Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 78 84
Subtotal
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 1,199,598 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 764,158 644,226
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 117,242 139,354
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 165,865 183,039
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 467,895 312,116
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 13,156 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 764,158 644,226
Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Derivatives 153 121
Total including derivatives 435,593 362,203
Significant Other Observable Inputs (Level 2) | Cash Equivalents
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and Cash equivalents 58,531 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 202,588 217,655
Significant Other Observable Inputs (Level 2) | Commercial Paper
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 105,598 70,434
Significant Other Observable Inputs (Level 2) | Corporate Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 65,387 55,755
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 3,258 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 78 84
Significant Other Observable Inputs (Level 2) | Subtotal
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 435,440 362,082
Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Contingent consideration 2,230 388
Liabilities $ 2,230 $ 388