SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	[1]	$ 1,516,506	$ 1,309,890	$ 3,945,897	$ 3,681,707
Gross profit		394,061	380,498	1,021,691	978,740
Depreciation, Depletion, Accretion & Amortization (DDA&A)		117,517	100,962	320,992	295,912
Cash and cash equivalents and restricted cash		136,430	1,084,730	136,430	1,084,730	$ 1,198,013	$ 274,506
Total assets		13,688,002	11,590,533	13,688,002	11,590,533	$ 11,686,905
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,613,760	1,388,324	4,175,360	3,889,248
Total assets	[2]	13,282,983	10,375,417	13,282,983	10,375,417
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(97,254)	(78,434)	(229,463)	(207,541)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,075,155	970,528	2,963,222	2,780,243
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[3]	1,172,409	1,048,962	3,192,685	2,987,784
Gross profit		372,346	337,891	969,817	883,184
Depreciation, Depletion, Accretion & Amortization (DDA&A)		93,344	82,487	258,480	240,370
Total assets	[2]	10,940,545	9,497,041	10,940,545	9,497,041
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(97,254)	(78,434)	(229,463)	(207,541)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	220,652	235,201	580,396	597,940
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[4]	220,652	235,201	580,396	597,940
Gross profit		7,075	30,217	17,616	58,246
Depreciation, Depletion, Accretion & Amortization (DDA&A)		8,956	8,644	27,111	26,046
Total assets	[2]	617,794	559,416	617,794	559,416
Asphalt [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]		0		0
Concrete [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	219,225	102,807	396,785	298,255
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	219,225	102,807	396,785	298,255
Gross profit		14,301	12,157	32,362	35,597
Depreciation, Depletion, Accretion & Amortization (DDA&A)		8,655	3,987	16,633	12,070
Total assets	[2]	1,720,748	315,349	1,720,748	315,349
Concrete [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]		0		0
Calcium [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,474	1,354	5,494	5,269
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,474	1,354	5,494	5,269
Gross profit		339	233	1,896	1,713
Depreciation, Depletion, Accretion & Amortization (DDA&A)		38	49	116	146
Total assets	[2]	3,896	3,611	3,896	3,611
Calcium [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]		0		0
Other Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion, Accretion & Amortization (DDA&A)		6,524	5,795	18,652	17,280
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 268,589	$ 130,386	$ 268,589	$ 130,386

[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, Mississippi, Oklahoma, Quintana Roo (Mexico), South Carolina and Texas West market — Arizona, California and New Mexico U.S. Concrete — British Columbia (Canada), California, Hawaii, New Jersey, New York, Oklahoma, Pennsylvania, Texas, the U.S. Virgin Islands, and Washington D.C.

[2] 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.

[3] 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.

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