SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues		$ 1,186,152	$ 1,418,758	$ 1,327,682	$ 996,511	$ 1,088,047	$ 1,240,197	$ 1,200,151	$ 854,474	$ 4,929,103	[1]	$ 4,382,869	[1]	$ 3,890,296	[1]
Gross profit		293,081	$ 400,643	$ 370,502	$ 191,675	275,285	$ 343,142	$ 323,184	$ 159,334	1,255,901		1,100,945		993,513
Depreciation, Depletion, Accretion and Amortization (DDA&A)										374,596		346,246		305,965
Capital Expenditures	[2]									404,348		475,229		464,233
Cash and cash equivalents and restricted cash		274,506				44,404				274,506		44,404		146,646		$ 268,019
Total assets		10,648,793				9,832,130				10,648,793		9,832,130		9,504,891
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									5,249,914		4,656,940		4,143,653
Total assets	[3]	10,221,359				9,685,498				10,221,359		9,685,498		9,112,326
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									(320,811)		(274,071)		(253,357)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									3,669,464		3,239,578		2,842,737
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[4]									3,990,275		3,513,649		3,096,094
Gross profit										1,146,649		991,858		854,524
Depreciation, Depletion, Accretion and Amortization (DDA&A)										305,046		281,641		245,151
Capital Expenditures	[2]									383,406		422,175		421,989
Total assets	[3]	9,334,218				8,887,749				9,334,218		8,887,749		8,409,505
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									(320,811)		(274,071)		(253,357)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									855,821		733,182		622,074
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[5]									855,821		733,182		622,074
Gross profit										63,023		56,480		91,313
Depreciation, Depletion, Accretion and Amortization (DDA&A)										35,199		31,290		25,400
Capital Expenditures	[2]									9,095		38,154		12,970
Total assets	[3]	558,386				527,226				558,386		527,226		426,575
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]									395,627		401,999		417,745
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									395,627		401,999		417,745
Gross profit										43,151		49,893		45,201
Depreciation, Depletion, Accretion and Amortization (DDA&A)										13,620		12,539		13,822
Capital Expenditures	[2]									11,641		12,291		25,176
Total assets	[3]	325,102				266,581				325,102		266,581		271,818
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]									8,191		8,110		7,740
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									8,191		8,110		7,740
Gross profit										3,078		2,714		2,475
Depreciation, Depletion, Accretion and Amortization (DDA&A)										232		272		677
Capital Expenditures	[2]									31		22		78
Total assets	[3]	3,653				3,942				3,653		3,942		4,428
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 and Amortization (DDA&A)										20,499		20,504		20,915
Corporate [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	[2]									175		2,587		4,020
Total assets		$ 152,928				$ 102,228				$ 152,928		$ 102,228		$ 245,919

[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] 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.