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Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 45,252
2018 42,563
2019 39,450
2020 27,580
2021 19,708
Thereafter $ 173,871