BUSINESS COMBINATION - Schedule of Unaudited Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Business Combinations [Abstract]
Revenue	$ 336.5	$ 337.0
Net loss attributable to U.S. Concrete	$ (1.6)	$ (2.6)
Net loss per share attributable to U.S. Concrete - basic (in dollars per share)	$ (0.10)	$ (0.16)
Net loss per share attributable to U.S. Concrete - diluted (in dollars per share)	$ (0.10)	$ (0.16)