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Financing Arrangements - Schedule of Minimum Payments Maturities of Principal Obligations Under Term Facility (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Less: current portion $ (2,750) $ (3,650)
Total long-term debt 265,393 $ 274,460
2017 Term Facility    
Debt Instrument [Line Items]    
2018 2,750  
2019 2,750  
2020 2,750  
2021 2,750  
2022 261,937  
Total principal outstanding 272,937  
Unamortized debt discount (2,036)  
Unamortized debt issuance costs (2,758)  
Total 268,143  
Less: current portion (2,750)  
Total long-term debt $ 265,393