GOODWILL AND INTANGIBLE ASSETS (Changes in Carrying Amount of Goodwill by Reportable Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill, Beginning balance		$ 3,122,321	$ 3,094,824
Goodwill of acquired businesses	[1]	43,075	27,497
Goodwill, Ending balance		3,165,396	3,122,321
Aggregates [Member]
Goodwill [Line Items]
Goodwill, Beginning balance		3,030,688	3,003,191
Goodwill of acquired businesses	[1]	43,075	27,497
Goodwill, Ending balance		3,073,763	3,030,688
Asphalt [Member]
Goodwill [Line Items]
Goodwill, Beginning balance		91,633	91,633
Goodwill of acquired businesses	[1]	0	0
Goodwill, Ending balance		91,633	91,633
Concrete [Member]
Goodwill [Line Items]
Goodwill, Beginning balance		0	0
Goodwill of acquired businesses	[1]	0	0
Goodwill, Ending balance		0	0
Calcium [Member]
Goodwill [Line Items]
Goodwill, Beginning balance		0	0
Goodwill of acquired businesses	[1]	0	0
Goodwill, Ending balance		$ 0	$ 0

[1] See Note 19 for a summary of acquisitions