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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
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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

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