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Financial Instruments - Investments from Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Total investments, Cost $ 118,829 $ 39,441
Total investments, Gross Unrealized Gain 13 1
Total investments, Gross Unrealized (Loss) (734) (476)
Total investments, Fair value 118,108 38,966
Municipal Bond [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total investments, Fair value 14,203 7,374
Non-governmental Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total investments, Fair value 88,769  
Treasury and Federal Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total investments, Fair value 15,136  
Short-term Investments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total investments, Cost 110,979  
Total investments, Gross Unrealized Gain 13  
Total investments, Gross Unrealized (Loss) (258)  
Total investments, Fair value 110,734  
Short-term Investments [Member] | Municipal Bond [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total investments, Cost 6,874  
Total investments, Gross Unrealized Gain 1  
Total investments, Gross Unrealized (Loss) (46)  
Total investments, Fair value 6,829  
Short-term Investments [Member] | Non-governmental Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total investments, Cost 88,948  
Total investments, Gross Unrealized Gain 8  
Total investments, Gross Unrealized (Loss) (187)  
Total investments, Fair value 88,769  
Short-term Investments [Member] | Treasury and Federal Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total investments, Cost 15,157  
Total investments, Gross Unrealized Gain 4  
Total investments, Gross Unrealized (Loss) (25)  
Total investments, Fair value 15,136  
Short-term Investments [Member] | U.S. Treasury Bills [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total investments, Cost   31,591
Total investments, Gross Unrealized Gain   1
Total investments, Gross Unrealized (Loss)   0
Total investments, Fair value   31,592
Long Term Investments [Member] | Municipal Bond [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total investments, Cost 7,850 7,850
Total investments, Gross Unrealized Gain 0 0
Total investments, Gross Unrealized (Loss) (476) (476)
Total investments, Fair value $ 7,374 $ 7,374