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GOODWILL AND INTANGIBLE ASSETS - Schedule of Estimated Amortization Expense of Intangibles (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remaining in 2019 $ 2,964  
2020 11,614  
2021 11,167  
2022 10,995  
2023 10,875  
Thereafter 51,277  
Total $ 98,892 $ 20,016