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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Money market instruments | $ 10,883 | $ 3,557
Financial assets at fair value | 758,391 |
Corporate bonds |  |
Assets: |  |
Financial assets at fair value | 289,873 |
Treasury bills |  |
Assets: |  |
Financial assets at fair value | 295,106 |
Asset-backed securities |  |
Assets: |  |
Financial assets at fair value | 140,370 |
Sovereign bonds |  |
Assets: |  |
Financial assets at fair value | 21,791 |
Municipal bonds |  |
Assets: |  |
Financial assets at fair value | 5,338 |
Agency bonds |  |
Assets: |  |
Financial assets at fair value | 5,913 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Money market instruments | 10,883 |
Economic hedge forward contracts | 0 |
Liabilities: |  |
Economic hedge forward contracts | 0 |
Contingent consideration liabilities | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds |  |
Assets: |  |
Financial assets at fair value | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Treasury bills |  |
Assets: |  |
Financial assets at fair value | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities |  |
Assets: |  |
Financial assets at fair value | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Sovereign bonds |  |
Assets: |  |
Financial assets at fair value | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds |  |
Assets: |  |
Financial assets at fair value | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Agency bonds |  |
Assets: |  |
Financial assets at fair value | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Money market instruments | 0 |
Economic hedge forward contracts | 34 |
Liabilities: |  |
Economic hedge forward contracts | 31 |
Contingent consideration liabilities | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds |  |
Assets: |  |
Financial assets at fair value | 289,873 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Treasury bills |  |
Assets: |  |
Financial assets at fair value | 295,106 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Assets: |  |
Financial assets at fair value | 140,370 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Sovereign bonds |  |
Assets: |  |
Financial assets at fair value | 21,791 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal bonds |  |
Assets: |  |
Financial assets at fair value | 5,338 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Agency bonds |  |
Assets: |  |
Financial assets at fair value | 5,913 |
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) |  |
Assets: |  |
Money market instruments | 0 |
Economic hedge forward contracts | 0 |
Liabilities: |  |
Economic hedge forward contracts | 0 |
Contingent consideration liabilities | 1,569 |
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) | Corporate bonds |  |
Assets: |  |
Financial assets at fair value | 0 |
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) | Treasury bills |  |
Assets: |  |
Financial assets at fair value | 0 |
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) | Asset-backed securities |  |
Assets: |  |
Financial assets at fair value | 0 |
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) | Sovereign bonds |  |
Assets: |  |
Financial assets at fair value | 0 |
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) | Municipal bonds |  |
Assets: |  |
Financial assets at fair value | 0 |
Fair Value, Measurements, Recurring | Unobservable Inputs (Level 3) | Agency bonds |  |
Assets: |  |
Financial assets at fair value | $ 0 |

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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References No definition available. + Details
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