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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Intangible Asset Type (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 56,479 | $ 36,179
Less accumulated amortization | (29,878) | (28,030)
Intangible assets, net | 26,601 | 8,149
Covenants Not-to-Compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 19,192 | 18,092
Less accumulated amortization | (17,371) | (16,851)
Intangible assets, net | 1,821 | 1,241
Client Lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 37,287 | 18,087
Less accumulated amortization | (12,507) | (11,179)
Intangible assets, net | $ 24,780 | $ 6,908

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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