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Marketable Investments - Summary of Company's Marketable Investments (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] |  |
Amortized Cost | $ 97,990 | $ 145,512
Gross Unrealized Gains | 136 | 407
Gross Unrealized Losses | (2,073) | (2,073)
Total short and long term | 96,053 | 143,846
State and Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 9,660 | 18,859
Gross Unrealized Gains | 5 | 27
Gross Unrealized Losses |  | (14)
Total short and long term | 9,665 | 18,872
Federal Agency and Corporate Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 77,330 | 115,653
Gross Unrealized Gains | 131 | 380
Gross Unrealized Losses | (165) | (29)
Total short and long term | 77,296 | 116,004
Total Short-Term Available-for-Sale Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 86,990 | 134,512
Gross Unrealized Gains | 136 | 407
Gross Unrealized Losses | (165) | (43)
Total short and long term | 86,961 | 134,876
ARS [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 11,000 | 11,000
Gross Unrealized Gains |  |
Gross Unrealized Losses | (1,908) | (2,030)
Total short and long term | $ 9,092 | $ 8,970

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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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