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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)