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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Intangible Asset Type (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 77,732 | $ 66,113
Less accumulated amortization | (34,385) | (31,346)
Intangible assets, net | 43,347 | 34,767
Covenants Not-to-Compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 25,669 | 21,750
Less accumulated amortization | (18,195) | (17,584)
Intangible assets, net | 7,474 | 4,166
Client Lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 52,063 | 44,363
Less accumulated amortization | (16,190) | (13,762)
Intangible assets, net | $ 35,873 | $ 30,601

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