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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Goodwill and Intangible Asset Impairment |  | $ 469,000 |
Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities: |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | $ 0 | 0 | $ 0
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net, non current | 0 | $ 0 | $ 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Money market instruments | 3,557,000 |  |
Corporate bonds | 0 |  |
Treasury bills | 0 |  |
Asset-backed securities | 0 |  |
Sovereign bonds | 0 |  |
Agency bonds | 0 |  |
Municipal bonds | 0 |  |
Economic hedge forward contracts |  |  |
Liabilities: |  |  |
Economic hedge forward contracts | 0 |  |
Contingent consideration liabilities | 0 |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Money market instruments | 0 |  |
Corporate bonds | 300,437,000 |  |
Treasury bills | 231,237,000 |  |
Asset-backed securities | 132,038,000 |  |
Sovereign bonds | 14,417,000 |  |
Agency bonds | 5,921,000 |  |
Municipal bonds | 5,337,000 |  |
Economic hedge forward contracts | 1,000 |  |
Liabilities: |  |  |
Economic hedge forward contracts | 106,000 |  |
Contingent consideration liabilities | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities: |  |  |
Contingent consideration liabilities | $ 2,544,000 |  |

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