REVENUES (Revenues by Geographic Market) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		$ 1,240,197	$ 1,094,715	$ 3,294,822	$ 2,912,806
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		1,319,062	1,166,089	3,502,556	3,103,329
Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		(78,865)	(71,374)	(207,734)	(190,523)
East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		449,381	423,381	1,138,082	1,040,194
Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		552,872	443,735	1,542,406	1,293,886
West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		316,809	298,973	822,068	769,249
Aggregates [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		904,866	787,325	2,431,919	2,136,062
Aggregates [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[1]	983,731	858,699	2,639,653	2,326,585
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		(78,865)	(71,374)	(207,734)	(190,523)
Aggregates [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		331,147	317,363	827,605	781,125
Aggregates [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		489,299	393,694	1,377,568	1,145,700
Aggregates [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		163,285	147,642	434,480	399,760
Asphalt [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		231,700	189,940	547,363	461,474
Asphalt [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues	[2]	231,700	189,940	547,363	461,474
Asphalt [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		0	0	0	0
Asphalt [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		52,263	39,445	113,331	78,599
Asphalt [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		47,220	21,571	100,708	64,051
Asphalt [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		132,217	128,924	333,324	318,824
Concrete [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		101,719	115,485	309,404	309,448
Concrete [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		101,719	115,485	309,404	309,448
Concrete [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		0	0	0	0
Concrete [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		65,971	66,573	197,146	180,470
Concrete [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		14,441	26,505	57,994	78,313
Concrete [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		21,307	22,407	54,264	50,665
Calcium [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		1,912	1,965	6,136	5,822
Calcium [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		1,912	1,965	6,136	5,822
Calcium [Member] | Intersegment Sales [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		0	0	0	0
Calcium [Member] | East [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		0	0	0	0
Calcium [Member] | Gulf Coast [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		1,912	1,965	6,136	5,822
Calcium [Member] | West [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total revenues		$ 0	$ 0	$ 0	$ 0

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

[2] Includes product sales, as well as service revenues from our asphalt construction paving business.