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Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) $ in Thousands | Jun. 30, 2019 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
1 year or less | $ 364,487
1-2 years | 293,554
2-3 years | 84,104
3-4 years | 22,812
4-5 years | 2,858
5-7 years | 4,704
Fair value | 772,519
Corporate Bonds |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 101,868
1-2 years | 103,324
2-3 years | 65,231
3-4 years | 5,710
4-5 years | 2,858
5-7 years | 0
Fair value | 278,991
Treasury Bills |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 138,600
1-2 years | 158,777
2-3 years | 10,113
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | 307,490
Asset-Backed Securities |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 104,998
1-2 years | 15,771
2-3 years | 8,760
3-4 years | 11,199
4-5 years | 0
5-7 years | 4,704
Fair value | 145,432
Sovereign Bonds |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 5,990
1-2 years | 14,833
2-3 years | 0
3-4 years | 0
4-5 years | 0
5-7 years |
Fair value | 20,823
Agency Bonds |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 7,783
1-2 years | 0
2-3 years | 0
3-4 years | 5,903
4-5 years | 0
5-7 years | 0
Fair value | 13,686
Municipal Bonds |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 5,248
1-2 years | 849
2-3 years | 0
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | $ 6,097

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