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Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail)
$ in Thousands
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 (remaining) $ 21,475
2019 40,182
2020 28,152
2021 20,272
2022 17,645
2023 17,280
Thereafter $ 139,195