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Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) $ in Thousands | Mar. 31, 2019 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
1 year or less | $ 441,337
1-2 years | 231,056
2-3 years | 50,840
3-4 years | 26,040
4-5 years | 6,252
5-7 years | 2,866
Fair value | 758,391
Corporate bonds |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 137,228
1-2 years | 102,129
2-3 years | 35,329
3-4 years | 12,360
4-5 years | 2,827
5-7 years | 0
Fair value | 289,873
Treasury bills |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 189,808
1-2 years | 105,298
2-3 years | 0
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | 295,106
Asset-backed securities |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 98,910
1-2 years | 19,283
2-3 years | 8,119
3-4 years | 7,767
4-5 years | 3,425
5-7 years | 2,866
Fair value | 140,370
Sovereign bonds |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 10,900
1-2 years | 3,499
2-3 years | 7,392
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | 21,791
Municipal bonds |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 4,491
1-2 years | 847
2-3 years | 0
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | 5,338
Agency bonds |
Debt Securities, Available-for-sale [Line Items] |
1 year or less | 0
1-2 years | 0
2-3 years | 0
3-4 years | 5,913
4-5 years | 0
5-7 years | 0
Fair value | $ 5,913

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