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Cash, Cash Equivalents, and Investments - Gross Unrealized Losses and Fair Values for Available-for-Sale Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | $ 174,876
Unrealized Losses, Less than 12 Months | (447)
Fair Value, Greater than 12 Months | 21,574
Unrealized Losses, Greater than 12 Months | (471)
Total Fair Value | 196,450
Total Unrealized Losses | (918)
Treasury Bills [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | 61,966
Unrealized Losses, Less than 12 Months | (139)
Total Fair Value | 61,966
Total Unrealized Losses | (139)
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | 58,258
Unrealized Losses, Less than 12 Months | (153)
Fair Value, Greater than 12 Months | 3,122
Unrealized Losses, Greater than 12 Months | (10)
Total Fair Value | 61,380
Total Unrealized Losses | (163)
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | 35,138
Unrealized Losses, Less than 12 Months | (111)
Fair Value, Greater than 12 Months | 18,452
Unrealized Losses, Greater than 12 Months | (461)
Total Fair Value | 53,590
Total Unrealized Losses | (572)
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | 15,434
Unrealized Losses, Less than 12 Months | (39)
Total Fair Value | 15,434
Total Unrealized Losses | (39)
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | 2,581
Unrealized Losses, Less than 12 Months | (4)
Total Fair Value | 2,581
Total Unrealized Losses | (4)
Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | 1,499
Unrealized Losses, Less than 12 Months | (1)
Total Fair Value | 1,499
Total Unrealized Losses | $ (1)

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