ACQUISITIONS AND BUSINESS COMBINATIONS - Schedule of Unaudited Pro Forma Information (Details) - Coram Material Corp. - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Business Acquisition [Line Items]
Revenue	$ 322.7	$ 659.2
Net income attributable to U.S. Concrete	$ 9.3	$ 7.7
Earnings per share attributable to U.S. Concrete - basic (in dollars per share)	$ 0.56	$ 0.46
Earnings per share attributable to U.S. Concrete - diluted (in dollars per share)	$ 0.56	$ 0.46