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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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] |  |  |
Assets: |  |  |
Money market instruments | 2,334,000 |  |
Corporate bonds | 0 |  |
Treasury bills | 0 |  |
Asset-backed securities | 0 |  |
Agency bonds | 0 |  |
Municipal bonds | 0 |  |
Cash flow hedge forward contracts | 0 |  |
Economic hedge forward contracts | 0 |  |
Liabilities: |  |  |
Economic hedge forward contracts | 0 |  |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets: |  |  |
Money market instruments | 0 |  |
Corporate bonds | 311,140,000 |  |
Treasury bills | 159,455,000 |  |
Asset-backed securities | 96,560,000 |  |
Euro liquidity funds | 46,499,000 |  |
Sovereign bonds | 30,883,000 |  |
Agency bonds | 13,242,000 |  |
Municipal bonds | 7,750,000 |  |
Cash flow hedge forward contracts | 43,000 |  |
Economic hedge forward contracts | 1,000 |  |
Liabilities: |  |  |
Economic hedge forward contracts | (11,000) |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Liabilities: |  |  |
Contingent consideration liabilities | $ (4,173,000) |  |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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