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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Schedule Of Capitalization Longterm Debt [Line Items]    
Total long-term debt (including current portion) $ 26,081 $ 26,978
2021 Consolidated Loan [Member]    
Schedule Of Capitalization Longterm Debt [Line Items]    
Debt instrument maturity date May 30, 2021  
Total long-term debt (including current portion) $ 26,100 $ 27,000
Debt instrument, interest rate 4.75%