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Cash, Cash Equivalents and Investments - Effective Maturity Dates of Available-for-Sale Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]  
Less than 1 Year $ 102,974
1-2 Years 90,461
2-3 Years 115,004
3-4 Years 22,814
4-5 Years 5,469
5-8 Years 767
Fair Value, Total 337,489
Corporate Bonds [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 1 Year 46,001
1-2 Years 14,188
2-3 Years 71,828
3-4 Years 10,180
4-5 Years 3,109
5-8 Years 767
Fair Value, Total 146,073
Asset-Backed Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 1 Year 17,666
1-2 Years 26,727
2-3 Years 7,983
Fair Value, Total 52,376
Treasury Bills [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 1 Year 5,997
1-2 Years 17,307
2-3 Years 18,969
Fair Value, Total 42,273
Agency Bonds [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 1 Year 7,482
1-2 Years 17,156
2-3 Years 8,196
3-4 Years 3,147
4-5 Years 942
Fair Value, Total 36,923
Municipal Bonds [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 1 Year 16,224
1-2 Years 12,902
2-3 Years 2,442
3-4 Years 1,084
4-5 Years 1,418
Fair Value, Total 34,070
Sovereign Bonds [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 1 Year 3,986
1-2 Years 757
2-3 Years 3,240
3-4 Years 6,609
Fair Value, Total 14,592
Covered Bonds [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Less than 1 Year 5,618
1-2 Years 1,424
2-3 Years 2,346
3-4 Years 1,794
Fair Value, Total $ 11,182