SEGMENT REPORTING (Narrative) (Details) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) state segment mi		Dec. 31, 2019 USD ($)		Dec. 31, 2018 USD ($)
Number of operating segments | segment										4
Number of reportable segments | segment										4
Radius for Delivering Product Maximum | mi										25
Radius for Delivering Product Minimum | mi										20
Revenues		$ 1,175,119	$ 1,309,890	$ 1,322,575	$ 1,049,242	$ 1,186,152	$ 1,418,758	$ 1,327,682	$ 996,511	$ 4,856,826	[1]	$ 4,929,103	[1]	$ 4,382,869	[1]
Concrete [Member]
Percentage of product weight attributable to Aggregates										80.00%
Number of states in which segments serve | state										4
Revenues	[1]									$ 383,617		395,627		401,999
Aggregates [Member]
Equity method investments		26,524				50,587				$ 26,524		50,587		39,395
Number of states in which segments serve | state										20
Number of additional states served | state										13
Revenues	[1]									$ 3,672,884		3,669,464		3,239,578
Asphalt [Member]
Percentage of product weight attributable to Aggregates										95.00%
Number of states in which segments serve | state										6
Revenues	[1]									$ 792,605		855,821		733,182
Asphalt [Member] | Asphalt Construction Paving [Member]
Number of states in which segments serve | state										3
United States [Member]
Revenues										$ 4,845,863		4,912,972		4,365,309
Nondomestic [Member]
Long-lived assets		$ 261,574				$ 274,439				261,574		274,439		278,520
Nondomestic [Member] | Aggregates [Member]
Revenues										10,963		16,131		17,560
Nondomestic [Member] | Asphalt, Concrete And Calcium [Member]
Revenues										$ 0		$ 0		$ 0

[1] ¹ The geographic markets are defined by states as follows: East market — Arkansas, Delaware, Illinois, Kentucky, Maryland, North Carolina, Pennsylvania, Tennessee, Virginia, and Washington D.C. Gulf Coast market — Alabama, Florida, Georgia, Louisiana, Mexico, Mississippi, Oklahoma, South Carolina and Texas West market — Arizona, California and New Mexico