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Goodwill and Intangibles - Schedule of Estimated Aggregate Annual Amortization (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Finite Lived Intangible Assets Net Amortization Expense Rolling Maturity [Abstract]  
Remainder of 2018 $ 5,442
2019 21,332
2020 20,400
2021 19,094
2022 18,176
Thereafter $ 55,265