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Goodwill and Other Intangibles - Estimated Amortization Expense of Intangible Assets (Detail)
$ in Thousands
Jun. 30, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
July - December 2018 $ 6,961
2019 13,724
2020 13,689
2021 12,998
2022 11,490
Thereafter 425,737
Net Balance $ 484,599