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Cash, Cash Equivalents and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) | Dec. 31, 2018 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Less than 1 Year | $ 427,348,000
1-2 Years | 149,507,000
2-3 Years | 64,174,000
3-4 Years | 36,985,000
4-5 Years | 7,542,000
5-7 Years | 3,831,000
Fair Value, Total | 689,387,000
Corporate Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Less than 1 Year | 137,871,000
1-2 Years | 81,921,000
2-3 Years | 56,459,000
3-4 Years | 20,060,000
4-5 Years | 4,126,000
5-7 Years | 0
Fair Value, Total | 300,437,000
Treasury Bills [Member] |
Debt Securities, Available-for-sale [Line Items] |
Less than 1 Year | 198,477,000
1-2 Years | 32,760,000
2-3 Years | 0
3-4 Years | 0
4-5 Years | 0
5-7 Years | 0
Fair Value, Total | 231,237,000
Asset-Backed Securities [Member] |
Debt Securities, Available-for-sale [Line Items] |
Less than 1 Year | 78,407,000
1-2 Years | 27,665,000
2-3 Years | 7,715,000
3-4 Years | 11,004,000
4-5 Years | 3,416,000
5-7 Years | 3,831,000
Fair Value, Total | 132,038,000
Sovereign Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Less than 1 Year | 8,101,000
1-2 Years | 6,316,000
2-3 Years | 0
3-4 Years | 0
4-5 Years | 0
5-7 Years | 0
Fair Value, Total | 14,417,000
Agency Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Less than 1 Year | 0
1-2 Years | 0
2-3 Years | 0
3-4 Years | 5,921,000
4-5 Years | 0
5-7 Years | 0
Fair Value, Total | 5,921,000
Municipal Bonds [Member] |
Debt Securities, Available-for-sale [Line Items] |
Less than 1 Year | 4,492,000
1-2 Years | 845,000
2-3 Years | 0
3-4 Years | 0
4-5 Years | 0
5-7 Years | 0
Fair Value, Total | $ 5,337,000

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