ACQUISITIONS - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Entity	Dec. 31, 2017 USD ($) Entity	Dec. 31, 2016 Entity
Business Acquisition [Line Items]
Number of acquisitions | Entity	21	30	31
Customer relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets | $	$ 33.5	$ 9.1
Customer relationships | Minimum
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, useful life	10 years
Customer relationships | Maximum
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, useful life	25 years