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Marketable Investments - Summary of Gross Unrealized Losses and Market Value of Available-for-Sale Securities with Unrealized Losses (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities, Less Than 12 Months, Market Value | $ 35,843 | $ 27,146
Available for sale securities, Less Than 12 Months, Unrealized Losses | 165 | 43
Available for sale securities, 12 Months or Greater, Market Value | 9,092 | 8,970
Available for sale securities, 12 Months or Greater, Unrealized Losses | 1,908 | 2,030
State and Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities, Less Than 12 Months, Market Value |  | 9,430
Available for sale securities, Less Than 12 Months, Unrealized Losses |  | 14
Available for sale securities, 12 Months or Greater, Market Value |  |
Available for sale securities, 12 Months or Greater, Unrealized Losses |  |
Federal Agency and Corporate Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities, Less Than 12 Months, Market Value | 35,843 | 17,716
Available for sale securities, Less Than 12 Months, Unrealized Losses | 165 | 29
Available for sale securities, 12 Months or Greater, Market Value |  |
Available for sale securities, 12 Months or Greater, Unrealized Losses |  |
ARS [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities, Less Than 12 Months, Market Value |  |
Available for sale securities, Less Than 12 Months, Unrealized Losses |  |
Available for sale securities, 12 Months or Greater, Market Value | 9,092 | 8,970
Available for sale securities, 12 Months or Greater, Unrealized Losses | $ 1,908 | $ 2,030

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- Definition Available for sale securities continuous unrealized loss position less than twelve months aggregate losses accumulated in investments. + References No definition available. + Details
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- Definition Available for sale securities continuous unrealized loss position twelve months or longer aggregate losses accumulated in 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 categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: 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=27724398&loc=d3e27337-111563 Reference 2: 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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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized 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 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: 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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