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Financial Instruments - Investments from Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Cost $ 38,337  
Long-term investments (available-for-sale), Cost 16,573  
Total investments (available for sale), Cost 54,910 39,441
Short-term investments (available-for-sale), Gross Unrealized, Gain 1  
Long-term investments (available-for-sale), Gross Unrealized, Gain     
Total investments (available for sale), Gross Unrealized, Gain 1 1
Short-term investments (available-for-sale), Gross Unrealized (Loss) (12)  
Long-term investments (available-for-sale), Gross Unrealized (Loss) (493)  
Total investments (available for sale), Gross Unrealized (Loss) (505) (476)
Short-term investments (available-for-sale), Fair value 54,406 38,966
Long-term investments (available-for-sale), Fair value 16,080  
Commercial paper [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Cost 15,641  
Short-term investments (available-for-sale), Gross Unrealized (Loss) (5)  
Short-term investments (available-for-sale), Fair value 15,636  
Corporate bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Cost 5,443  
Long-term investments (available-for-sale), Cost 8,723  
Long-term investments (available-for-sale), Gross Unrealized, Gain     
Short-term investments (available-for-sale), Gross Unrealized (Loss) (7)  
Long-term investments (available-for-sale), Gross Unrealized (Loss) (17)  
Short-term investments (available-for-sale), Fair value 5,436  
Long-term investments (available-for-sale), Fair value 8,706  
U.S. Treasury bills [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Cost 17,253 31,591
Short-term investments (available-for-sale), Gross Unrealized, Gain 1 1
Short-term investments (available-for-sale), Gross Unrealized (Loss)     
Short-term investments (available-for-sale), Fair value 17,254 31,592
Short-term Investments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Fair value 38,326  
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) (476)
Short-term investments (available-for-sale), Fair value 7,374 7,374
Long-term investments (available-for-sale), Fair value $ 7,374 $ 7,374