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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, 2016 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | $ 294,355
Unrealized Losses, Less than 12 months | (814)
Fair Value, Greater than 12 Months | 20,929
Unrealized Losses, Greater than 12 Months | (34)
Fair Value | 315,284
Unrealized Losses | (848)
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | 117,853
Unrealized Losses, Less than 12 months | (400)
Fair Value, Greater than 12 Months | 14,931
Unrealized Losses, Greater than 12 Months | (30)
Fair Value | 132,784
Unrealized Losses | (430)
Treasury Bills [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | 99,358
Unrealized Losses, Less than 12 months | (199)
Fair Value | 99,358
Unrealized Losses | (199)
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | 45,429
Unrealized Losses, Less than 12 months | (70)
Fair Value, Greater than 12 Months | 5,998
Unrealized Losses, Greater than 12 Months | (4)
Fair Value | 51,427
Unrealized Losses | (74)
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | 27,687
Unrealized Losses, Less than 12 months | (140)
Fair Value, Greater than 12 Months | 0
Unrealized Losses, Greater than 12 Months | 0
Fair Value | 27,687
Unrealized Losses | (140)
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 months | 4,028
Unrealized Losses, Less than 12 months | (5)
Unrealized Losses, Greater than 12 Months | 0
Fair Value | 4,028
Unrealized Losses | $ (5)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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