SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Total revenues		$ 1,008,140	$ 1,038,460	$ 2,719,693	$ 2,564,896
Gross profit		304,209	291,290	761,112	603,604
Depreciation, depletion, accretion and amortization		72,049	69,662	213,362	204,770
Cash and cash equivalents		135,365	168,681	135,365	168,681	$ 284,060	$ 141,273
Total assets		8,358,085	8,316,866	8,358,085	8,316,866	$ 8,301,632
Segment sales [Member]
Total revenues		1,072,735	1,099,863	2,886,256	2,711,458
Total assets	[1]	8,108,692	8,042,121	8,108,692	8,042,121
Aggregates [Member] | Segment sales [Member]
Total revenues	[2]	821,809	830,783	2,248,174	2,067,671
Gross profit		261,762	250,866	664,154	525,816
Depreciation, depletion, accretion and amortization		60,204	57,732	177,129	170,251
Total assets	[1]	7,671,222	7,533,172	7,671,222	7,533,172
Aggregates [Member] | Intersegment sales [Member]
Total revenues		(64,595)	(61,403)	(166,563)	(146,562)
Asphalt Mix [Member] | Segment sales [Member]
Total revenues		157,406	178,865	388,560	410,934
Gross profit		32,889	30,020	76,028	59,973
Depreciation, depletion, accretion and amortization		4,100	4,124	12,468	12,131
Total assets	[1]	243,909	315,003	243,909	315,003
Concrete [Member] | Segment sales [Member]
Total revenues		91,147	88,013	242,790	226,400
Gross profit		8,711	9,578	18,334	15,280
Depreciation, depletion, accretion and amortization		3,072	2,955	9,141	8,457
Total assets	[1]	188,169	188,331	188,169	188,331
Calcium [Member] | Segment sales [Member]
Total revenues		2,373	2,202	6,732	6,453
Gross profit		847	826	2,596	2,535
Depreciation, depletion, accretion and amortization		198	170	577	496
Total assets	[1]	5,392	5,615	5,392	5,615
Other [Member]
Depreciation, depletion, accretion and amortization		4,475	4,681	14,047	13,435
Corporate [Member]
Total assets		$ 114,028	$ 106,064	$ 114,028	$ 106,064

[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.