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GOODWILL AND INTANGIBLE ASSETS - Components of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 105,780	$ 97,284
Less accumulated amortization	(47,456)	(38,563)
Intangible assets, net	58,324	58,721
Intangible amortization expenses	8,893	7,218	$ 3,316
Covenants Not-to-Compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets	26,971	26,162
Less accumulated amortization	(20,547)	(18,968)
Intangible assets, net	6,424	7,194
Client Lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets	78,809	71,122
Less accumulated amortization	(26,909)	(19,595)
Intangible assets, net	$ 51,900	$ 51,527

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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