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Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Oct. 22, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Line of credit $ 20,000   $ 10,801
Debt issuance costs (4,766)   (5,302)
Total term debt 227,297   223,098
Current portion long-term debt, net of unamortized discount 10,593   7,928
Long-term debt, net 216,704   215,170
Former Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of credit     10,801
New Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of credit 20,000    
Former Term Loan A Facility [Member]      
Debt Instrument [Line Items]      
Carrying values of debt instruments     $ 228,400
New Term Loan Facility [Member]      
Debt Instrument [Line Items]      
Carrying values of debt instruments $ 232,063 $ 235,000