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Schedule of Future Amortization Charges Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]        
2018 $ 10,732      
2019 10,732      
2020 10,784      
2021 10,675      
2022 10,554      
Thereafter 127,473      
Net Book Value $ 180,950 $ 121,433 $ 129,160 $ 100,211