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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
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