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Short-Term and Long-Term Investments - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Amortized Cost And Fair Value Debt Securities [Abstract]    
Due in one year or less, Cost $ 460  
Due in two to ten years, Cost 360  
Due in ten to twenty years, Cost     
Due in twenty to forty years, Cost 6,000  
Total Cost 6,820 7,845
Due in one year or less, Estimated Fair Value 463  
Due in two to ten years, Estimated fair Value 363  
Due in ten to twenty years, Estimated Fair Value     
Due in twenty to forty years, Estimated Fair Value 4,825  
Estimated Fair Value $ 5,651 $ 6,736