SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues		$ 1,200,151	$ 1,030,763	$ 2,054,625	$ 1,818,091
Gross profit		323,184	290,017	482,519	448,238
Depreciation, depletion, accretion and amortization		85,633	76,775	167,072	148,339
Cash and cash equivalents and restricted cash		61,115	1,129,799	61,115	1,129,799	$ 146,646	$ 268,019
Total assets		9,844,784	9,869,943	9,844,784	9,869,943	$ 9,504,891
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues		1,277,098	1,100,528	2,183,494	1,937,240
Total assets	[1]	9,658,172	8,527,698	9,658,172	8,527,698
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues		(76,947)	(69,765)	(128,869)	(119,149)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues		879,318	747,821	1,527,053	1,348,737
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[2]	956,265	817,586	1,655,922	1,467,886
Gross profit	[3]	283,476	251,419	431,697	390,210
Depreciation, depletion, accretion and amortization		69,738	60,832	135,691	118,488
Total assets	[1]	8,751,186	7,931,603	8,751,186	7,931,603
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues		(76,947)	(69,765)	(128,869)	(119,149)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues		211,828	175,758	315,663	271,534
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues		211,828	175,758	315,663	271,534
Gross profit	[3]	25,750	28,760	25,996	37,242
Depreciation, depletion, accretion and amortization		7,298	6,615	14,300	12,347
Total assets	[1]	625,985	358,801	625,985	358,801
Asphalt [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues		0	0	0	0
Concrete [Member]
Segment Reporting Information [Line Items]
Total revenues		106,723	105,213	207,685	193,963
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues		106,723	105,213	207,685	193,963
Gross profit	[3]	13,191	9,253	23,511	19,478
Depreciation, depletion, accretion and amortization		3,049	3,672	6,463	6,695
Total assets	[1]	276,743	233,355	276,743	233,355
Concrete [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues		0	0	0	0
Calcium [Member]
Segment Reporting Information [Line Items]
Total revenues		2,282	1,971	4,224	3,857
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues		2,282	1,971	4,224	3,857
Gross profit		767	585	1,315	1,308
Depreciation, depletion, accretion and amortization		70	192	139	387
Total assets	[1]	4,258	3,939	4,258	3,939
Calcium [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues		0	0	0	0
Other Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, accretion and amortization		5,478	5,464	10,479	10,422
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 125,497	$ 212,446	$ 125,497	$ 212,446

[1] 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.

[2] Includes product sales, as well as freight & delivery costs that we pass along to our customers, and service revenues related to aggregates.

[3] The 2017 amounts have been revised as a result of our adoption of ASU 2017-07 as described in Note 17