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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
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