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Cash, Cash Equivalents and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail)
Dec. 31, 2015
USD ($)
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