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Cash, Cash Equivalents, and Investments - Effective Maturity Dates of 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] |
Less than 1 Year | $ 133,620
1-2 Years | 133,499
2-3 Years | 96,042
3-4 Years | 9,220
4-5 Years | 1,892
Fair Value | 374,273
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 80,386
1-2 Years | 48,477
2-3 Years | 54,059
3-4 Years | 6,729
4-5 Years | 515
Fair Value | 190,166
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 26,910
1-2 Years | 35,072
2-3 Years | 6,194
Fair Value | 68,176
Treasury Bills [Member] |
Schedule of Available-for-sale Securities [Line Items] |
1-2 Years | 29,870
2-3 Years | 22,545
Fair Value | 52,415
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 7,383
1-2 Years | 11,263
2-3 Years | 10,907
4-5 Years | 882
Fair Value | 30,435
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 14,443
1-2 Years | 8,817
2-3 Years | 2,337
3-4 Years | 2,491
4-5 Years | 495
Fair Value | 28,583
Commercial Paper [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 3,000
Fair Value | 3,000
Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 1,498
Fair Value | $ 1,498

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- Definition This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Available-for-sale securities, debt maturities after third year but before fourth year, fair value. + References No definition available. + Details
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- Definition Available-for-sale securities, debt maturities after second year but before third year, fair value. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at fair value maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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