ACQUISITIONS - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) Entity	Dec. 31, 2016 USD ($) Entity	Dec. 31, 2015 Entity
Business Acquisition [Line Items]
Number of acquisitions | Entity	30	31	43
Net increase (decrease) in goodwill	$ 46.5	$ 52.8
Effect of goodwill on income taxes	44.5
Customer relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets	$ 28.2
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	30 years