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Cash, Cash Equivalents and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) | Dec. 31, 2015 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | $ 296,468,000
1-2 Years | 129,794,000
2-3 Years | 119,223,000
3-4 Years | 16,574,000
4-5 Years | 6,161,000
5-7 Years | 394,000
Fair Value, Total | 568,614,000
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 54,376,000
1-2 Years | 87,025,000
2-3 Years | 74,069,000
3-4 Years | 13,280,000
4-5 Years | 2,201,000
5-7 Years | 0
Fair Value, Total | 230,951,000
Treasury Bills [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 109,360,000
1-2 Years | 19,489,000
2-3 Years | 24,948,000
3-4 Years | 0
4-5 Years | 0
5-7 Years | 0
Fair Value, Total | 153,797,000
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 61,994,000
1-2 Years | 2,491,000
2-3 Years | 14,443,000
3-4 Years | 3,294,000
4-5 Years | 3,960,000
5-7 Years | 394,000
Fair Value, Total | 86,576,000
Euro liquidity fund [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 47,730,000
1-2 Years | 0
2-3 Years | 0
3-4 Years | 0
4-5 Years | 0
5-7 Years | 0
Fair Value, Total | 47,730,000
Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 978,000
1-2 Years | 4,894,000
2-3 Years | 3,286,000
3-4 Years | 0
4-5 Years | 0
5-7 Years | 0
Fair Value, Total | 9,158,000
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 21,440,000
1-2 Years | 11,026,000
2-3 Years | 2,477,000
3-4 Years | 0
4-5 Years | 0
5-7 Years | 0
Fair Value, Total | 34,943,000
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 590,000
1-2 Years | 4,869,000
2-3 Years | 0
3-4 Years | 0
4-5 Years | 0
5-7 Years | 0
Fair Value, Total | $ 5,459,000

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