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Goodwill and Long-Lived Intangible Assets - Schedule of Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 43,652  
2019 35,770  
2020 19,331  
2021 7,253  
2022 5,003  
Thereafter 11,999  
Net carrying amount - Intangible assets $ 123,008 $ 122,997