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Cash, Cash Equivalents, and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) $ in Thousands | Sep. 30, 2018 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |
1 year or less | $ 420,016
1-2 years | 151,316
2-3 years | 74,115
3-4 years | 40,471
4-5 years | 6,572
5-7 years | 9,455
Fair value | 701,945
Corporate Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 138,099
1-2 years | 80,605
2-3 years | 68,684
3-4 years | 22,429
4-5 years | 1,434
5-7 years | 2,855
Fair value | 314,106
Treasury Bills |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 193,347
1-2 years | 32,711
2-3 years | 0
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | 226,058
Asset-Backed Securities |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 71,438
1-2 years | 30,840
2-3 years | 5,431
3-4 years | 12,102
4-5 years | 5,138
5-7 years | 6,600
Fair value | 131,549
Sovereign Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 8,119
1-2 years | 6,318
2-3 years | 0
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | 14,437
Agency Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 2,969
1-2 years | 0
2-3 years | 0
3-4 years | 5,940
4-5 years | 0
5-7 years | 0
Fair value | 8,909
Municipal Bonds |
Schedule of Available-for-sale Securities [Line Items] |
1 year or less | 6,044
1-2 years | 842
2-3 years | 0
3-4 years | 0
4-5 years | 0
5-7 years | 0
Fair value | $ 6,886

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