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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 | Jun. 30, 2013
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Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | $ 245,885
Unrealized Losses, Less than 12 Months | (1,389)
Fair Value, 12 Months or Greater | 1,570
Unrealized Losses, 12 Months or Greater | (2)
Total Fair Value | 247,455
Total Unrealized Losses | (1,391)
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | 107,235
Unrealized Losses, Less than 12 Months | (658)
Total Fair Value | 107,235
Total Unrealized Losses | (658)
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | 23,007
Unrealized Losses, Less than 12 Months | (177)
Total Fair Value | 23,007
Total Unrealized Losses | (177)
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | 5,846
Unrealized Losses, Less than 12 Months | (33)
Total Fair Value | 5,846
Total Unrealized Losses | (33)
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | 59,180
Unrealized Losses, Less than 12 Months | (449)
Fair Value, 12 Months or Greater | 1,570
Unrealized Losses, 12 Months or Greater | (2)
Total Fair Value | 60,750
Total Unrealized Losses | (451)
Treasury Bills [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Fair Value, Less than 12 Months | 50,617
Unrealized Losses, Less than 12 Months | (72)
Total Fair Value | 50,617
Total Unrealized Losses | $ (72)

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized loss on investments in available-for-sale equity securities impacting investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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