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Marketable Investments - Summary of Maturity Periods of the Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
FY 2014 $ 3,531  
FY 2015 26,201  
FY 2016 16,192  
Thereafter 9,573  
Total 55,497 81,013
State and Municipal Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
FY 2015 1,982  
Total 1,982 6,814
Federal Agency and Corporate Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
FY 2014 3,531  
FY 2015 24,219  
FY 2016 16,192  
Thereafter 9,573  
Total $ 53,515 $ 74,199