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Marketable Securities - Additional Information (Detail) (USD $)
6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Aggregate fair value of available-for-sale securities with unrealized losses $ 73,100,000  
Gross unrealized losses on available-for-sale securities 124,000 45,000
Aggregate fair value of available-for-sales securities in a continuous loss position greater than 12 months 4,600,000  
Aggregate loss of available-for-sale securities in a continuous loss position greater than 12 months $ 18,000