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Marketable Investments - Summary of Maturity Periods of the Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
FY 2013, Total | $ 26,554 |
FY 2014, Total | 42,365 |
FY 2015, Total | 38,729 |
Thereafter, Total | 24,822 |
Total short and long term | 132,470 | 143,846
State and Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
FY 2013, Total | 6,309 |
FY 2014, Total | 10,092 |
FY 2015, Total | 2,089 |
Thereafter, Total |  |
Total short and long term | 18,490 | 18,872
Federal Agency and Corporate Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
FY 2013, Total | 20,245 |
FY 2014, Total | 32,273 |
FY 2015, Total | 36,640 |
Thereafter, Total | 15,902 |
Total short and long term | 105,060 | 116,004
ARS [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
FY 2013, Total |  |
FY 2014, Total |  |
FY 2015, Total |  |
Thereafter, Total | 8,920 |
Total short and long term | $ 8,920 | $ 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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