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Schedule of Future Amortization Charges Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]        
2019 $ 12,822      
2020 12,822      
2021 12,713      
2022 12,592      
2023 11,972      
Thereafter 123,662      
Net Book Value $ 186,583 $ 180,950 $ 121,433 $ 129,160