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Short-Term and Long-Term Investments - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Available-for-sale Securities, Debt Maturities [Abstract]    
Due in two to ten years, Cost $ 340  
Due in ten to twenty years, Cost 0  
Due in twenty to forty years, Cost 3,000  
Cost 3,340 $ 3,700
Due in two to ten years, Estimated Fair Value 341  
Due in ten to twenty years, Estimated Fair Value 0  
Due in twenty to forty years, Estimated Fair Value 2,614  
Estimated Fair Value $ 2,955 $ 3,272