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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Unamortized deferred financing costs $ (594) $ (677)
Debt, net 264,406 215,523
Term loan- secured    
Debt Instrument [Line Items]    
Line of credit facility maximum borrowing capacity 125,000 125,000
Revolving credit facility- secured    
Debt Instrument [Line Items]    
Line of credit facility outstanding amount $ 140,000 $ 91,200