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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - currency forward contracts $ 2,185 $ 1,966
Derivatives - currency forward contracts 307  
Short-term investments 196,842 129,594
Other current assets 2,185 1,966
Other current liabilities 307  
Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - currency forward contracts 2,185 2,110
Total assets 540,662 418,828
Derivatives - currency forward contracts 307  
Cash and cash equivalents 100,727 129,923
Short-term investments 196,842 129,594
Other current assets 2,185 2,110
Total current assets 299,754 261,627
Available-for-sale investments 240,908 157,201
Other current liabilities 307  
Money Market Funds [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 100,637 129,092
Bankers' Acceptance Drafts [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 90 131
Available-for-sale investments 266 82
Time Deposits and Certificates of Deposit [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 21,152 20,948
Commercial Paper [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 1,446  
Asset-Backed Securities [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 134,917 75,674
U.S. Agency Obligations [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 102,165 98,049
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 100,637 129,092
Cash and cash equivalents 100,637 129,092
Total current assets 100,637 129,092
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 100,637 129,092
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives - currency forward contracts 2,185 2,110
Total assets 440,025 289,736
Derivatives - currency forward contracts 307  
Cash and cash equivalents 90 831
Short-term investments 196,842 129,594
Other current assets 2,185 2,110
Total current assets 199,117 132,535
Available-for-sale investments 240,908 157,201
Other current liabilities 307  
Significant Other Observable Inputs (Level 2) [Member] | Bankers' Acceptance Drafts [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 90 131
Available-for-sale investments 266 82
Significant Other Observable Inputs (Level 2) [Member] | Time Deposits and Certificates of Deposit [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 21,152 20,948
Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 1,446  
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 134,917 75,674
Significant Other Observable Inputs (Level 2) [Member] | U.S. Agency Obligations [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 102,165 98,049
Corporate Obligations [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents   700
Available-for-sale investments 169,423 88,689
Corporate Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents   700
Available-for-sale investments 169,423 88,689
Municipal Bonds [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 8,381 3,353
Municipal Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments $ 8,381 $ 3,353