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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Intangible Asset Type (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 35,483 | $ 33,665
Less accumulated amortization | (27,487) | (25,969)
Intangible assets, net | 7,996 | 7,696
Covenants Not-to-Compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 17,975 | 17,594
Less accumulated amortization | (16,739) | (16,402)
Intangible assets, net | 1,236 | 1,192
Client Lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 17,508 | 16,071
Less accumulated amortization | (10,748) | (9,567)
Intangible assets, net | $ 6,760 | $ 6,504

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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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