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Schedule of Future Amortization Charges Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]        
2017 $ 7,911      
2018 7,793      
2019 7,793      
2020 7,523      
2021 7,438      
Thereafter 82,975      
Net Book Value $ 121,433 $ 129,160 $ 100,211 $ 107,007