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Goodwill and Intangibles - Schedule of Estimated Aggregate Annual Amortization (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
Finite Lived Intangible Assets Net Amortization Expense Rolling Maturity [Abstract]  
Remainder of 2018 $ 16,966
2019 19,054
2020 18,338
2021 17,320
2022 16,402
Thereafter $ 48,805