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Goodwill and Other Intangible Assets - Estimated Amortization Expenses (Detail)
$ in Thousands
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remaining 2018 $ 23,554
2019 44,004
2020 38,834
2021 34,324
2022 $ 32,618