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Summary of Estimated Future Amortization of Identifiable Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
2017 $ 2.4  
2018 2.4  
2019 2.4  
2020 2.4  
2021 2.4  
Thereafter 0.5  
Identifiable intangible assets, net $ 12.5 $ 15.1