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Goodwill and Intangible Assets - Estimated Future Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2016 $ 14,489
2017 14,366
2018 8,198
2019 7,605
2020 5,104
2021 and thereafter $ 1,134