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Long-Term Investments - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]    
Due in one year or less, Cost $ 611  
Due in two to ten years, Cost 630  
Due in ten to twenty years, Cost     
Due in twenty to forty years, Cost 6,000  
Total Cost 7,241 7,845
Due in one year or less, Estimated Fair Value 612  
Due in two to ten years, Estimated fair Value 637  
Due in ten to twenty years, Estimated Fair Value     
Due in twenty to forty years, Estimated Fair Value 4,982  
Estimated Fair Value $ 6,231 $ 6,736