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Investments - Estimated Fair Value and Gross Unrealized Loss Position for AFS Debt Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value $ 53,569 $ 331,622
Less Than 12 Months, Unrealized Losses (26) (792)
12 Months or Greater, Fair Value 116,149 245,745
12 Months or Greater, Unrealized Losses (93) (1,376)
Total Fair Value 169,718 577,367
Total Unrealized Losses (119) (2,168)
Commercial paper    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 9,984 51,927
Less Than 12 Months, Unrealized Losses (1) (45)
Total Fair Value 9,984 51,927
Total Unrealized Losses (1) (45)
Corporate debt securities    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value 43,585 274,696
Less Than 12 Months, Unrealized Losses (25) (746)
12 Months or Greater, Fair Value 111,155 234,798
12 Months or Greater, Unrealized Losses (87) (1,321)
Total Fair Value 154,740 509,494
Total Unrealized Losses (112) (2,067)
Securities of government-sponsored entities    
Schedule Of Available For Sale Securities [Line Items]    
Less Than 12 Months, Fair Value   4,999
Less Than 12 Months, Unrealized Losses   (1)
12 Months or Greater, Fair Value 4,994 10,947
12 Months or Greater, Unrealized Losses (6) (55)
Total Fair Value 4,994 15,946
Total Unrealized Losses $ (6) $ (56)