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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
Mar. 31, 2014
Dec. 31, 2013
Amortized Cost And Fair Value Debt Securities [Abstract]    
Due in one year or less, Cost $ 640  
Due in two to ten years, Cost 180  
Due in ten to twenty years, Cost     
Due in twenty to forty years, Cost 6,000  
Total Cost 6,820 6,820
Due in one year or less, Estimated Fair Value 643  
Due in two to ten years, Estimated Fair Value 181  
Due in ten to twenty years, Estimated Fair Value     
Due in twenty to forty years, Estimated Fair Value 4,864  
Estimated Fair Value $ 5,688 $ 5,651