REVENUES (Revenues by Geographic Market) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Total 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]
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									5,128,228		5,249,914		4,656,940
Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									(271,402)		(320,811)		(274,071)
East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									1,604,014		1,682,549		1,523,330
Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									2,422,525		2,386,712		2,033,447
West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									1,101,689		1,180,653		1,100,163
Aggregates [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									3,672,884		3,669,464		3,239,578
Aggregates [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1],[2]									3,944,286		3,990,275		3,513,649
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									(271,402)		(320,811)		(274,071)
Aggregates [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									1,198,169		1,254,748		1,109,489
Aggregates [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									2,165,155		2,117,526		1,821,853
Aggregates [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									580,962		618,001		582,307
Asphalt [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									792,605		855,821		733,182
Asphalt [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1],[3]									792,605		855,821		733,182
Asphalt [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									0		0		0
Asphalt [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									142,184		166,552		156,591
Asphalt [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									178,501		194,367		131,745
Asphalt [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									471,920		494,902		444,846
Concrete [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									383,617		395,627		401,999
Concrete [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									383,617		395,627		401,999
Concrete [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									0		0		0
Concrete [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									263,661		261,249		257,250
Concrete [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									71,149		66,628		71,739
Concrete [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									48,807		67,750		73,010
Calcium [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									7,720		8,191		8,110
Calcium [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									7,720		8,191		8,110
Calcium [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									0		0		0
Calcium [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									0		0		0
Calcium [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									7,720		8,191		8,110
Calcium [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]									$ 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

[2] Includes product sales, as well as freight & delivery costs that we pass along to our customers, and service revenues (see Note 2) related to aggregates.

[3] Includes product sales, as well as service revenues (see Note 2) from our asphalt construction paving business.