SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenues	[1]	$ 1,418,758	$ 1,240,197	$ 3,742,951	$ 3,294,822
Gross profit		400,643	343,142	962,820	825,661
Depreciation, Depletion, Accretion and Amortization (DDA&A)		96,247	89,390	278,925	256,463
Cash and cash equivalents and restricted cash		91,102	43,069	91,102	43,069	$ 44,404	$ 146,646
Total assets		10,539,673	9,875,635	10,539,673	9,875,635	$ 9,832,130
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,518,405	1,319,062	3,986,043	3,502,556
Total assets		10,310,394	9,724,532	10,310,394	9,724,532
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(99,647)	(78,865)	(243,092)	(207,734)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,033,438	904,866	2,787,019	2,431,919
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[2]	1,133,085	983,731	3,030,111	2,639,653
Gross profit		357,202	303,787	872,133	735,484
Depreciation, Depletion, Accretion and Amortization (DDA&A)		78,978	72,729	227,259	208,420
Total assets	[3]	9,403,342	8,890,421	9,403,342	8,890,421
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(99,647)	(78,865)	(243,092)	(207,734)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	270,237	231,700	649,490	547,363
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[4]	270,237	231,700	649,490	547,363
Gross profit		27,639	23,857	51,950	49,853
Depreciation, Depletion, Accretion and Amortization (DDA&A)		8,909	8,428	26,343	22,728
Total assets	[3]	601,059	551,336	601,059	551,336
Asphalt [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0	0	0	0
Concrete [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	112,964	101,719	300,369	309,404
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	112,964	101,719	300,369	309,404
Gross profit		15,037	14,587	36,487	38,098
Depreciation, Depletion, Accretion and Amortization (DDA&A)		3,371	3,041	9,662	9,504
Total assets	[3]	302,003	278,487	302,003	278,487
Concrete [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0	0	0	0
Calcium [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	2,119	1,912	6,073	6,136
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	2,119	1,912	6,073	6,136
Gross profit		765	911	2,250	2,226
Depreciation, Depletion, Accretion and Amortization (DDA&A)		59	68	177	207
Total assets	[3]	3,990	4,288	3,990	4,288
Calcium [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0	0	0	0
Other Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion, Accretion and Amortization (DDA&A)		4,930	5,124	15,484	15,604
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 138,177	$ 108,034	$ 138,177	$ 108,034

[1] 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 Bahamas West market — Arizona, California and New Mexico

[2] Includes product sales (crushed stone, sand and gravel, sand, and other aggregates), as well as freight & delivery costs that we pass along to our customers, and service revenues (see Note 4) related to aggregates.

[3] Certain temporarily idled assets are included within a segment's Identifiable Assets but the associated DDA&A is shown within Other in the DDA&A section above as the related DDA&A is excluded from segment gross profit.

[4] Includes product sales, as well as service revenues (see Note 4) from our asphalt construction paving business.