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Goodwill and Other Intangible Assets, Net - Estimated Future Amortization Expense of Definite Life Intangible Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2018 $ 14,000  
2019 27,800  
2020 22,200  
2021 18,900  
2022 14,300  
2023 and thereafter 109,000  
Net definite life intangible assets $ 206,239 $ 219,044