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Investments - Fair Value of Long-Term Available-for-Sale Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Fair value of long-term available-for-sale investments $ 80,912 $ 60,405
Time Deposits [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fair value of long-term available-for-sale investments 54 54
Asset Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fair value of long-term available-for-sale investments 26,411  
Corporate Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fair value of long-term available-for-sale investments 36,341  
U.S. Agency Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Fair value of long-term available-for-sale investments $ 18,106 $ 60,351