SEGMENT REPORTING (Narrative) (Details) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) state segment mi		Dec. 31, 2017 USD ($)		Dec. 31, 2016 USD ($)
Number of operating segments | segment										4
Number of reportable segments | segment										4
Radius for delivering product, minimum | mi										20
Radius for delivering product, maximum | mi										25
Revenues		$ 1,088,047	$ 1,240,197	$ 1,200,151	$ 854,474	$ 977,490	$ 1,094,715	$ 1,030,763	$ 787,328	$ 4,382,869	[1]	$ 3,890,296	[1]	$ 3,592,667	[1]
Concrete [Member]
Number Of States In Which Segments Serve | state										5
Percentage of product weight attributable to Aggregates										80.00%
Revenues	[1]									$ 401,999		417,745		330,125
Aggregates [Member]
Number Of States In Which Segments Serve | state										20
Number Of Additional States Served | state										9
Revenues	[1]									$ 3,239,578		2,842,737		2,741,372
Equity method investments		39,395				22,967				$ 39,395		22,967		22,965
Asphalt [Member]
Number Of States In Which Segments Serve | state										6
Percentage of product weight attributable to Aggregates										95.00%
Revenues	[1]									$ 733,182		622,074		512,310
Asphalt [Member] | Asphalt Construction Paving [Member]
Number Of States In Which Segments Serve | state										3
United States [Member]
Revenues										$ 4,365,309		3,872,494		3,579,427
Nondomestic [Member]
Long-lived assets		$ 278,520				$ 211,282				278,520		211,282		188,652
Nondomestic [Member] | Aggregates [Member]
Revenues										17,560		17,802		13,240
Nondomestic [Member] | Asphalt, Concrete And Calcium [Member]
Revenues										$ 0		$ 0		$ 0

[1] The geographic markets are defined by states/countries 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, Texas and the BahamasWest market - Arizona, California and New Mexico