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Cash, Cash Equivalents, and Available-For-Sale Investments - Portfolio of Cash and Investments in Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments | $ 197,959 | $ 252,760
Cash, including restricted cash | 37,614 | 26,947
Total cash and investments in marketable securities | 262,026 | 302,194
Corporate Notes and Bonds [Member] | Fair Value Hierarchy Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments | 138,515 | 241,158
U.S. Corporate Commercial Paper [Member] | Fair Value Hierarchy Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments | 59,444 | 3,990
Obligations of U.S. Government Agencies [Member] | Fair Value Hierarchy Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments |  | 6,108
Obligations of U.S. States and Municipalities [Member] | Fair Value Hierarchy Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale investments |  | 1,504
Money Market Funds [Member] | Fair Value Hierarchy Level 1 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Money market funds | $ 26,453 | $ 22,487

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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