BUSINESS COMBINATIONS - Estimate of Results of Operations As If Acquisitions Had Been Completed (Details) - 2018 Acquisitions $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares
Business Acquisition [Line Items]
Revenue | $	$ 1,523.2
Net income attributable to U.S. Concrete | $	$ 29.4
Net income per share attributable to U.S. Concrete - basic (in USD per share) | $ / shares	$ 1.79
Net income per share attributable to U.S. Concrete - diluted (in USD per share) | $ / shares	$ 1.78