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Cash, Cash Equivalents and Investments - Gross Unrealized Losses and Fair Value for Available-for-Sale Investments (Detail) $ in Thousands | Dec. 31, 2015 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | $ 411,183
Unrealized Losses, Less than 12 months | (1,615)
Fair Value, Greater than 12 Months | 26,729
Unrealized Losses, Greater than 12 Months | (203)
Fair Value | 437,912
Unrealized Losses | (1,818)
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | 162,714
Unrealized Losses, Less than 12 months | (1,092)
Fair Value, Greater than 12 Months | 24,946
Unrealized Losses, Greater than 12 Months | (197)
Fair Value | 187,660
Unrealized Losses | (1,289)
Treasury Bills [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | 127,203
Unrealized Losses, Less than 12 months | (252)
Fair Value | 127,203
Unrealized Losses | (252)
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | 77,165
Unrealized Losses, Less than 12 months | (154)
Fair Value, Greater than 12 Months | 1,783
Unrealized Losses, Greater than 12 Months | (6)
Fair Value | 78,948
Unrealized Losses | (160)
Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | 9,158
Unrealized Losses, Less than 12 months | (20)
Unrealized Losses, Greater than 12 Months | 0
Fair Value | 9,158
Unrealized Losses | (20)
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | 34,943
Unrealized Losses, Less than 12 months | (97)
Fair Value | 34,943
Unrealized Losses | $ (97)

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