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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Oct. 01, 2017	Dec. 31, 2016
Assets:
Money market instruments	$ 6,700	$ 2,334
Financial assets at fair value	659,762
Corporate Bonds
Assets:
Financial assets at fair value	311,509
Treasury Bills
Assets:
Financial assets at fair value	133,786
Asset-Backed Securities
Assets:
Financial assets at fair value	106,909
Euro Liquidity Fund
Assets:
Financial assets at fair value	52,312
Sovereign Bonds
Assets:
Financial assets at fair value	28,971
Agency Bonds
Assets:
Financial assets at fair value	13,245
Municipal Bonds
Assets:
Financial assets at fair value	13,030
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Money market instruments	6,700
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Money market instruments	0
Economic hedge forward contracts	0
Liabilities:
Economic hedge forward contracts	13
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate Bonds
Assets:
Financial assets at fair value	311,509
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Treasury Bills
Assets:
Financial assets at fair value	133,786
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Asset-Backed Securities
Assets:
Financial assets at fair value	106,909
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Euro Liquidity Fund
Assets:
Financial assets at fair value	52,312
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Sovereign Bonds
Assets:
Financial assets at fair value	28,971
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Agency Bonds
Assets:
Financial assets at fair value	13,245
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Municipal Bonds
Assets:
Financial assets at fair value	13,030
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Liabilities:
Contingent consideration liabilities	$ 3,673

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