GOODWILL (Changes in Carrying Amount of Goodwill by Reportable Segment) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Line Items]
Goodwill, Beginning balance	$ 3,167,061
Goodwill of acquired businesses	5,051	[1]
Goodwill, Ending balance	3,172,112
Aggregates [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	3,075,428
Goodwill of acquired businesses	5,051	[1]
Goodwill, Ending balance	3,080,479
Asphalt [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	91,633
Goodwill of acquired businesses	0	[1]
Goodwill, Ending balance	91,633
Concrete [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	0
Goodwill of acquired businesses	0	[1]
Goodwill, Ending balance	0
Calcium [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	0
Goodwill of acquired businesses	0	[1]
Goodwill, Ending balance	$ 0

[1] See Note 16 for a summary of recent acquisitions.