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Cash, Cash Equivalents, and Investments - Effective Maturity Dates of 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] |
Less than 1 Year | $ 184,822
1-2 Years | 105,079
2-3 Years | 117,581
3-4 Years | 5,039
Fair Value | 412,521
Corporate Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 109,040
1-2 Years | 64,080
2-3 Years | 42,686
3-4 Years | 3,143
Fair Value | 218,949
Asset-Backed Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 53,559
1-2 Years | 14,917
2-3 Years | 6,903
Fair Value | 75,379
Treasury Bills [Member] |
Schedule of Available-for-sale Securities [Line Items] |
1-2 Years | 16,003
2-3 Years | 57,663
Fair Value | 73,666
Sovereign Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 11,448
1-2 Years | 8,810
2-3 Years | 7,575
Fair Value | 27,833
Municipal Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 9,276
1-2 Years | 1,269
2-3 Years | 2,754
3-4 Years | 1,896
Fair Value | 15,195
Agency Bonds [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than 1 Year | 1,499
Fair Value | $ 1,499

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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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