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Financial Instruments - Investments from Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Total investments (available for sale), Cost $ 60,052 $ 71,729
Short-term investments (available-for-sale), Gross Unrealized, Gain 8 4
Short-term investments (available-for-sale), Gross Unrealized (Loss) (468) (475)
Short-term investments (available-for-sale), Fair value 59,592 71,258
U.S. Treasury bills [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Cost 52,202 63,879
Short-term investments (available-for-sale), Gross Unrealized, Gain 8 4
Short-term investments (available-for-sale), Gross Unrealized (Loss)   (7)
Short-term investments (available-for-sale), Fair value 52,210 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) (468) (468)
Short-term investments (available-for-sale), Fair value 7,382 7,382
Long-term investments (available-for-sale), Fair value $ 7,382 $ 7,382