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Cash, Cash Equivalents and Investments - Gross Unrealized Losses and Fair Value for Available-for-Sale Investments (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Fair Value, Less than 12 months $ 318,908
Unrealized Losses, Less than 12 months (1,445)
Fair Value, Greater than 12 Months 163,775
Unrealized Losses, Greater than 12 Months (810)
Fair Value 482,683
Unrealized Losses (2,255)
Corporate Bonds [Member]  
Debt Securities, Available-for-sale [Line Items]  
Fair Value, Less than 12 months 145,596
Unrealized Losses, Less than 12 months (1,268)
Fair Value, Greater than 12 Months 99,886
Unrealized Losses, Greater than 12 Months (495)
Fair Value 245,482
Unrealized Losses (1,763)
Treasury Bills [Member]  
Debt Securities, Available-for-sale [Line Items]  
Fair Value, Less than 12 months 114,836
Unrealized Losses, Less than 12 months (73)
Fair Value, Greater than 12 Months 13,850
Unrealized Losses, Greater than 12 Months (13)
Fair Value 128,686
Unrealized Losses (86)
Asset-Backed Securities [Member]  
Debt Securities, Available-for-sale [Line Items]  
Fair Value, Less than 12 months 47,762
Unrealized Losses, Less than 12 months (91)
Fair Value, Greater than 12 Months 44,585
Unrealized Losses, Greater than 12 Months (262)
Fair Value 92,347
Unrealized Losses (353)
Sovereign Bonds [Member]  
Debt Securities, Available-for-sale [Line Items]  
Fair Value, Less than 12 months 3,492
Unrealized Losses, Less than 12 months (4)
Fair Value, Greater than 12 Months 4,609
Unrealized Losses, Greater than 12 Months (30)
Fair Value 8,101
Unrealized Losses (34)
Agency Bonds [Member]  
Debt Securities, Available-for-sale [Line Items]  
Fair Value, Less than 12 months 5,920
Unrealized Losses, Less than 12 months (9)
Fair Value, Greater than 12 Months 0
Unrealized Losses, Greater than 12 Months 0
Fair Value 5,920
Unrealized Losses (9)
Municipal Bonds [Member]  
Debt Securities, Available-for-sale [Line Items]  
Fair Value, Less than 12 months 1,302
Unrealized Losses, Less than 12 months 0
Fair Value, Greater than 12 Months 845
Unrealized Losses, Greater than 12 Months (10)
Fair Value 2,147
Unrealized Losses $ (10)