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Cash and Cash Equivalents and Investments - Investments from Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Total investments (available for sale), Cost $ 39,441 $ 71,729
Short-term investments (available-for-sale), Gross Unrealized, Gain 1 4
Short-term investments (available-for-sale), Gross Unrealized (Loss) (476) (475)
Short-term investments (available-for-sale), Fair value 38,966 71,258
U.S. Treasury bills [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Cost 31,591 63,879
Short-term investments (available-for-sale), Gross Unrealized, Gain 1 4
Short-term investments (available-for-sale), Gross Unrealized (Loss)   (7)
Short-term investments (available-for-sale), Fair value 31,592 63,876
Municipal bond [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Long-term investments (available-for-sale), Cost 7,850 7,850
Long-term investments (available-for-sale), Gross Unrealized, Gain      
Long-term investments (available-for-sale), Gross Unrealized (Loss) (476) (468)
Short-term investments (available-for-sale), Fair value 7,374 7,382
Long-term investments (available-for-sale), Fair value $ 7,374 $ 7,382