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Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | $ 1,473,905 | $ 1,304,867
U.S. Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 855,795 | 902,800
Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 282,840 | 161,630
Corporate Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 133,186 | 100,153
Certificates of Deposit and Time Deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 167,342 | 82,133
U.S. Government Agency Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 10,726 | 39,252
Equity and Debt Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 23,430 | 18,171
Non-U.S. Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 586 | 728
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total | 1,903,748 | 1,612,751
Derivative assets | 389 | 1
Total | 1,904,137 | 1,612,752
Contingent consideration | 45,102 | 38,332
Derivative liabilities | 446 | 131
Total | 45,548 | 38,463
Fair Value, Measurements, Recurring | Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 197,955 | 214,722
Fair Value, Measurements, Recurring | Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 231,888 | 93,162
Fair Value, Measurements, Recurring | U.S. Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 855,795 | 902,800
Fair Value, Measurements, Recurring | Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 282,840 | 161,630
Fair Value, Measurements, Recurring | Corporate Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 133,186 | 100,153
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 | 167,342 | 82,133
Fair Value, Measurements, Recurring | U.S. Government Agency Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 10,726 | 39,252
Fair Value, Measurements, Recurring | Equity and Debt Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 23,430 | 18,171
Fair Value, Measurements, Recurring | Non-U.S. Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 586 | 728
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 | 427,720 | 270,351
Total | 427,720 | 270,351
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 | 197,955 | 214,722
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 | 206,335 | 37,458
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 | 23,430 | 18,171
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total | 1,476,028 | 1,342,400
Derivative assets | 389 | 1
Total | 1,476,417 | 1,342,401
Derivative liabilities | 446 | 131
Total | 446 | 131
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 | 25,553 | 55,704
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 | 855,795 | 902,800
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 | 282,840 | 161,630
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 | 133,186 | 100,153
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 | 167,342 | 82,133
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 | 10,726 | 39,252
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 | 586 | 728
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Contingent consideration | 45,102 | 38,332
Total | $ 45,102 | $ 38,332

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