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Long-term debts, net - Summary of Long-term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Less: unamortized debt issuance costs   $ (3,737)
Long-term debt, net   62,963
Less: Current portion of long-term debt $ (3,500) (2,750)
Long-term debt, net (non-current)   $ 60,213
7.5% Refinanced Term Loan, Due 2023 [Member]    
Debt Instrument [Line Items]    
Principal amount 70,000  
Less: unamortized debt issuance costs (5,954)  
Long-term debt, net 64,046  
Less: Current portion of long-term debt (3,500)  
Long-term debt, net (non-current) $ 60,546