SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues		$ 956,825	$ 895,143	$ 1,711,552	$ 1,526,436
Gross profit		292,184	234,449	456,903	312,314
Depreciation, depletion, accretion and amortization		71,908	68,384	141,314	135,108
Cash and cash equivalents		91,902	74,736	91,902	74,736	$ 284,060	$ 141,273
Total assets		8,290,113	8,195,883	8,290,113	8,195,883	$ 8,301,632
Identifiable assets [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	8,175,084	8,007,517	8,175,084	8,007,517
Segment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		1,017,246	943,371	1,813,520	1,611,595
Aggregates [Member]
Segment Reporting Information [Line Items]
Gross profit		254,008	207,285	402,392	274,950
Depreciation, depletion, accretion and amortization		59,414	57,003	116,925	112,519
Aggregates [Member] | Identifiable assets [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	7,742,618	7,497,240	7,742,618	7,497,240
Aggregates [Member] | Segment sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[2]	791,497	733,379	1,426,365	1,236,888
Aggregates [Member] | Intersegment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		(60,421)	(48,228)	(101,968)	(85,159)
Asphalt Mix [Member]
Segment Reporting Information [Line Items]
Gross profit		30,925	21,135	43,139	29,953
Depreciation, depletion, accretion and amortization		4,136	4,098	8,368	8,007
Asphalt Mix [Member] | Identifiable assets [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	237,546	319,284	237,546	319,284
Asphalt Mix [Member] | Segment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		142,055	128,998	231,154	232,069
Concrete [Member]
Segment Reporting Information [Line Items]
Gross profit		6,146	4,892	9,623	5,702
Depreciation, depletion, accretion and amortization		3,088	2,774	6,069	5,502
Concrete [Member] | Identifiable assets [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	189,355	185,473	189,355	185,473
Concrete [Member] | Segment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		81,246	78,598	151,643	138,387
Calcium [Member]
Segment Reporting Information [Line Items]
Gross profit		1,105	1,137	1,749	1,709
Depreciation, depletion, accretion and amortization		196	164	379	326
Calcium [Member] | Identifiable assets [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	5,565	5,520	5,565	5,520
Calcium [Member] | Segment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		2,448	2,396	4,358	4,251
Other [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, accretion and amortization		5,074	4,345	9,573	8,754
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 23,127	$ 113,630	$ 23,127	$ 113,630

[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 crushed stone, sand and gravel, sand, other aggregates, as well as freight, delivery and transportation revenues, and other revenues related to services.