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Goodwill and Other Intangible Assets - Estimated Amortization Expense in Future Years (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
2017 $ 30,305  
2018 23,462  
2019 18,026  
2020 13,323  
2021 8,621  
Later years 3,918  
Future Amortization Expense, Total $ 97,655 $ 140,268