GOODWILL AND INTANGIBLE ASSETS (Changes in Carrying Amount of Goodwill by Reportable Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill, Beginning balance		$ 3,167,061	$ 3,165,396
Goodwill of acquired businesses	[1]	5,051	1,665
Goodwill, Ending balance		3,172,112	3,167,061
Aggregates [Member]
Goodwill [Line Items]
Goodwill, Beginning balance		3,075,428	3,073,763
Goodwill of acquired businesses	[1]	5,051	1,665
Goodwill, Ending balance		3,080,479	3,075,428
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 recent acquisitions.