SEGMENT REPORTING (Segment Financial Disclosure) (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		Dec. 31, 2017
Segment Reporting Information [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]
Gross profit		302,741	$ 380,498	$ 396,519	$ 201,723	293,081	$ 400,643	$ 370,502	$ 191,675	1,281,481		1,255,901		1,100,945
Depreciation, Depletion, Accretion & Amortization (DDA&A)										396,806		374,596		346,246
Capital Expenditures	[2]									363,360		404,348		475,229
Cash and cash equivalents and restricted cash		1,198,013				274,506				1,198,013		274,506		44,404		$ 146,646
Total assets		11,686,905				10,648,793				11,686,905		10,648,793		9,832,130
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									5,128,228		5,249,914		4,656,940
Total assets	[3]	10,341,112				10,221,359				10,341,112		10,221,359		9,685,498
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									(271,402)		(320,811)		(274,071)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									3,672,884		3,669,464		3,239,578
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[4]									3,944,286		3,990,275		3,513,649
Gross profit										1,159,178		1,146,649		991,858
Depreciation, Depletion, Accretion & Amortization (DDA&A)										321,127		305,046		281,641
Capital Expenditures	[2]									331,893		383,406		422,175
Total assets	[3]	9,459,185				9,334,218				9,459,185		9,334,218		8,887,749
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									(271,402)		(320,811)		(274,071)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									792,605		855,821		733,182
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[5]									792,605		855,821		733,182
Gross profit										75,233		63,023		56,480
Depreciation, Depletion, Accretion & Amortization (DDA&A)										34,956		35,199		31,290
Capital Expenditures	[2]									19,803		9,095		38,154
Total assets	[3]	573,059				558,386				573,059		558,386		527,226
Asphalt [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									0		0		0
Concrete [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									383,617		395,627		401,999
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									383,617		395,627		401,999
Gross profit										44,159		43,151		49,893
Depreciation, Depletion, Accretion & Amortization (DDA&A)										16,010		13,620		12,539
Capital Expenditures	[2]									11,664		11,641		12,291
Total assets	[3]	305,523				325,102				305,523		325,102		266,581
Concrete [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									0		0		0
Calcium [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									7,720		8,191		8,110
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									7,720		8,191		8,110
Gross profit										2,911		3,078		2,714
Depreciation, Depletion, Accretion & Amortization (DDA&A)										189		232		272
Capital Expenditures	[2]									0		31		22
Total assets	[3]	3,345				3,653				3,345		3,653		3,942
Calcium [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									0		0		0
Other Segments [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion, Accretion & Amortization (DDA&A)										24,524		20,499		20,504
Corporate [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	[2]									0		175		2,587
Total assets		$ 147,780				$ 152,928				$ 147,780		$ 152,928		$ 102,228

[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] Capital expenditures include capitalized replacements of and additions to property, plant & equipment, including renewals and betterments. Capital expenditures exclude property, plant & equipment obtained by business acquisitions.

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

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