SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Segment Reporting Information [Line Items]
Total revenues		$ 1,088,047	$ 1,240,197	$ 1,200,151	$ 854,474	$ 977,490	$ 1,094,715	$ 1,030,763	$ 787,328	$ 4,382,869	[1]	$ 3,890,296	[1]	$ 3,592,667	[1]
Gross profit		275,285	$ 343,142	$ 323,184	$ 159,334	241,517	$ 303,758	$ 290,017	$ 158,221	1,100,945		993,513		988,885
Depreciation, Depletion, Accretion and Amortization (DDA&A)										346,246		305,965		284,940
Capital Expenditures	[2]									475,229		464,233		344,941
Cash and cash equivalents and restricted cash		44,404				146,646				44,404		146,646		268,019		$ 285,210
Total assets		9,832,130				9,504,891				9,832,130		9,504,891		8,471,475
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									4,656,940		4,143,653		3,813,130
Total assets	[3]	9,685,498				9,112,326				9,685,498		9,112,326		8,046,371
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									(274,071)		(253,357)		(220,463)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									3,239,578		2,842,737		2,741,372
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[4]									3,513,649		3,096,094		2,961,835
Gross profit	[5]									991,858		854,524		863,811
Depreciation, Depletion, Accretion and Amortization (DDA&A)										281,641		245,151		236,472
Capital Expenditures	[2]									422,175		421,989		297,737
Total assets	[3]	8,887,749				8,409,505				8,887,749		8,409,505		7,589,225
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									(274,071)		(253,357)		(220,463)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									733,182		622,074		512,310
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									733,182		622,074		512,310
Gross profit	[5]									56,480		91,313		96,608
Depreciation, Depletion, Accretion and Amortization (DDA&A)										31,290		25,400		16,797
Capital Expenditures	[2]									38,154		12,970		29,002
Total assets	[3]	527,226				426,575				527,226		426,575		259,514
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]									401,999		417,745		330,125
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									401,999		417,745		330,125
Gross profit	[5]									49,893		45,201		24,992
Depreciation, Depletion, Accretion and Amortization (DDA&A)										12,539		13,822		12,129
Capital Expenditures	[2]									12,291		25,176		10,047
Total assets	[3]	266,581				271,818				266,581		271,818		192,673
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]									8,110		7,740		8,860
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]									8,110		7,740		8,860
Gross profit										2,714		2,475		3,474
Depreciation, Depletion, Accretion and Amortization (DDA&A)										272		677		774
Capital Expenditures	[2]									22		78		534
Total assets	[3]	3,942				4,428				3,942		4,428		4,959
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)										20,504		20,915		18,768
Corporate [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	[2]									2,587		4,020		7,621
Total assets		$ 102,228				$ 245,919				$ 102,228		$ 245,919		$ 157,085

[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 BahamasWest market - Arizona, California and New Mexico

[2] Capital expenditures include capitalized replacements of and additions to property, plant & equipment, including capitalized leases, 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] The 2017 and 2016 amounts have been revised as a result of our adoption of ASU 2017-07 as described in Note 1 under the captions New Accounting Standards and Accounting Standards Recently Adopted.