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Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities $ 743,624 $ 1,004,576
U.S. Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 419,958 402,154
Corporate Debt Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 161,634 141,467
U.S. Government Agency Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 83,952 258,502
Certificates of Deposit and Time Deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 43,394 49,036
Commercial Paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 20,308 140,638
Equity And Debt Mutual Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 13,954 12,333
Non-U.S. Government Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 424 446
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Total 1,008,329 1,298,832
Derivative assets 109 220
Total 1,008,438 1,299,052
Contingent consideration 37,436 3,350
Derivative liabilities 146 369
Total 37,582 3,719
Fair Value, Measurements, Recurring | Cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 213,336 111,471
Fair Value, Measurements, Recurring | Cash Equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 51,369 182,785
Fair Value, Measurements, Recurring | U.S. Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 419,958 402,154
Fair Value, Measurements, Recurring | Corporate Debt Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 161,634 141,467
Fair Value, Measurements, Recurring | U.S. Government Agency Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 83,952 258,502
Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 43,394 49,036
Fair Value, Measurements, Recurring | Commercial Paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 20,308 140,638
Fair Value, Measurements, Recurring | Equity And Debt Mutual Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 13,954 12,333
Fair Value, Measurements, Recurring | Non-U.S. Government Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 424 446
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Total 276,531 284,022
Total 276,531 284,022
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 213,336 111,471
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Cash Equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 49,241 160,218
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Equity And Debt Mutual Funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 13,954 12,333
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Total 731,798 1,014,810
Derivative assets 109 220
Total 731,907 1,015,030
Derivative liabilities 146 369
Total 146 369
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Cash Equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Cash and cash equivalents 2,128 22,567
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. Treasury Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 419,958 402,154
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate Debt Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 161,634 141,467
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. Government Agency Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 83,952 258,502
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 43,394 49,036
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Commercial Paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 20,308 140,638
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Non-U.S. Government Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Available for sale securities 424 446
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Contingent consideration 37,436 3,350
Total $ 37,436 $ 3,350