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Long-Term Debt - Principal Amount and Unamortized Discount (Detail) (Term Loan [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
May 23, 2013
Term Loan [Member]
     
Debt Instrument [Line Items]      
Principal amount $ 14,000 $ 20,000 $ 20,000
Less: Unamortized original issue discount (851) (1,510)  
Term Loan, net of unamortized original issue discount $ 13,149 $ 18,490