SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues		$ 754,728	$ 631,293
Gross profit		164,718	77,865
Depreciation, depletion, accretion and amortization		69,406	66,723
Cash items		191,886	392,657	$ 284,060	$ 141,273
Total assets		8,247,025	8,326,525	$ 8,301,632
Identifiable assets [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	8,046,450	7,835,230
Segment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		796,274	668,224
Aggregates [Member]
Segment Reporting Information [Line Items]
Gross profit		148,383	67,665
Depreciation, depletion, accretion and amortization		57,511	55,515
Aggregates [Member] | Identifiable assets [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	7,614,796	7,331,703
Aggregates [Member] | Segment sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[2]	634,868	503,509
Aggregates [Member] | Intersegment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		(41,546)	(36,931)
Asphalt Mix [Member]
Segment Reporting Information [Line Items]
Gross profit		12,214	8,818
Depreciation, depletion, accretion and amortization		4,232	3,909
Asphalt Mix [Member] | Identifiable assets [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	233,025	324,521
Asphalt Mix [Member] | Segment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		89,099	103,071
Concrete [Member]
Segment Reporting Information [Line Items]
Gross profit		3,477	810
Depreciation, depletion, accretion and amortization		2,981	2,728
Concrete [Member] | Identifiable assets [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	193,323	173,284
Concrete [Member] | Segment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		70,397	59,789
Calcium [Member]
Segment Reporting Information [Line Items]
Gross profit		644	572
Depreciation, depletion, accretion and amortization		183	162
Calcium [Member] | Identifiable assets [Member]
Segment Reporting Information [Line Items]
Total assets	[1]	5,306	5,722
Calcium [Member] | Segment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		1,910	1,855
Other [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, accretion and amortization		4,499	4,409
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 8,689	$ 98,638

[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.