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Cash, Cash Equivalents and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) $ in Thousands | Dec. 31, 2016 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | $ 341,194
1-2 Years | 213,098
2-3 Years | 92,650
3-4 Years | 12,741
4-5 Years | 5,846
Fair Value, Total | 665,529
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 141,188
1-2 Years | 84,007
2-3 Years | 77,975
3-4 Years | 2,211
4-5 Years | 5,759
Fair Value, Total | 311,140
Treasury Bills [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 67,175
1-2 Years | 92,280
2-3 Years | 0
3-4 Years | 0
4-5 Years | 0
Fair Value, Total | 159,455
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 69,614
1-2 Years | 8,957
2-3 Years | 7,372
3-4 Years | 10,530
4-5 Years | 87
Fair Value, Total | 96,560
Euro liquidity fund [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 46,499
1-2 Years | 0
2-3 Years | 0
3-4 Years | 0
4-5 Years | 0
Fair Value, Total | 46,499
Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 2,903
1-2 Years | 7,614
2-3 Years | 2,725
3-4 Years | 0
4-5 Years | 0
Fair Value, Total | 13,242
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 7,298
1-2 Years | 19,007
2-3 Years | 4,578
3-4 Years | 0
4-5 Years | 0
Fair Value, Total | 30,883
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 6,517
1-2 Years | 1,233
2-3 Years | 0
3-4 Years | 0
4-5 Years | 0
Fair Value, Total | $ 7,750

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