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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Liabilities: |  |  |
Contingent consideration liability (Note 20) | $ (3,000,000) |  |
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 | 6,024,000 |  |
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: |  |  |
Cash flow hedge forward contracts | 0 |  |
Economic hedge forward contracts | 0 |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets: |  |  |
Money market instruments | 0 |  |
Corporate bonds | 230,951,000 |  |
Treasury bills | 153,797,000 |  |
Asset-backed securities | 86,576,000 |  |
Euro liquidity funds | 47,730,000 |  |
Sovereign bonds | 34,943,000 |  |
Agency bonds | 9,158,000 |  |
Municipal bonds | 5,459,000 |  |
Cash flow hedge forward contracts | 441,000 |  |
Economic hedge forward contracts | 9,000 |  |
Liabilities: |  |  |
Cash flow hedge forward contracts | (201,000) |  |
Economic hedge forward contracts | (43,000) |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities: |  |  |
Contingent consideration liability (Note 20) | $ (3,000,000) |  |

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