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Summary of Investments Classified as Available-For-Sale Securities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Estimated Fair Value $ 387,484 $ 200,287
Certificates of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Estimated Fair Value 10,078 17,438
Commercial paper    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Estimated Fair Value 23,955 7,498
Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Estimated Fair Value 323,219 174,323
Securities of government sponsored entities    
Schedule of Available-for-sale Securities [Line Items]    
Aggregate Estimated Fair Value 30,232 1,028
Short-term investments    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 305,439 162,919
Gross Unrealized Gains [1] 4 6
Gross Unrealized Losses [1] (447) (130)
Aggregate Estimated Fair Value 304,996 162,795
Short-term investments | Certificates of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,120 9,072
Gross Unrealized Gains [1] 1 0
Gross Unrealized Losses [1] (1) (6)
Aggregate Estimated Fair Value $ 9,120 $ 9,066
Short-term investments | Certificates of deposit | Maximum    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities contractual maturity 1 year 1 year
Short-term investments | Commercial paper    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 23,965 $ 7,497
Gross Unrealized Gains [1] 1 1
Gross Unrealized Losses [1] (11) 0
Aggregate Estimated Fair Value $ 23,955 $ 7,498
Short-term investments | Commercial paper | Maximum    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities contractual maturity 1 year 1 year
Short-term investments | Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 254,592 $ 145,321
Gross Unrealized Gains [1] 1 5
Gross Unrealized Losses [1] (414) (123)
Aggregate Estimated Fair Value $ 254,179 $ 145,203
Short-term investments | Corporate debt securities | Maximum    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities contractual maturity 1 year 1 year
Short-term investments | Securities of government sponsored entities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 17,762 $ 1,029
Gross Unrealized Gains [1] 1 0
Gross Unrealized Losses [1] (21) (1)
Aggregate Estimated Fair Value $ 17,742 $ 1,028
Short-term investments | Securities of government sponsored entities | Maximum    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities contractual maturity 1 year 1 year
Long-term investments    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 83,022 $ 37,645
Gross Unrealized Gains [1] 0 0
Gross Unrealized Losses [1] (534) (153)
Aggregate Estimated Fair Value 82,488 37,492
Long-term investments | Certificates of deposit    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 960 8,400
Gross Unrealized Gains [1] 0 0
Gross Unrealized Losses [1] (2) (28)
Aggregate Estimated Fair Value $ 958 $ 8,372
Long-term investments | Certificates of deposit | Minimum    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities contractual maturity 1 year 1 year
Long-term investments | Certificates of deposit | Maximum    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities contractual maturity 2 years 2 years
Long-term investments | Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 69,528 $ 29,245
Gross Unrealized Gains [1] 0 0
Gross Unrealized Losses [1] (488) (125)
Aggregate Estimated Fair Value $ 69,040 $ 29,120
Long-term investments | Corporate debt securities | Minimum    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities contractual maturity 1 year 1 year
Long-term investments | Corporate debt securities | Maximum    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities contractual maturity 2 years 2 years
Long-term investments | Securities of government sponsored entities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 12,534  
Gross Unrealized Gains [1] 0  
Gross Unrealized Losses [1] (44)  
Aggregate Estimated Fair Value $ 12,490  
Long-term investments | Securities of government sponsored entities | Minimum    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities contractual maturity 1 year  
Long-term investments | Securities of government sponsored entities | Maximum    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities contractual maturity 2 years  
[1] (1) Unrealized gains and losses are included in other comprehensive loss.