ACQUISITIONS AND DIVESTITURES (Narrative) (Details)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) property	Jun. 30, 2017 USD ($) property	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) property
Significant Acquisitions and Disposals [Line Items]
Cash consideration | $		$ 210,562,000	$ 1,611,000	$ 32,537,000
Total consideration | $		212,406,000		33,287,000
Consideration payable amount | $				750,000
Assets held for sale | $	$ 0	0	$ 0	0
Acquisitions 2017 [Member]
Significant Acquisitions and Disposals [Line Items]
Amortizable intangible assets recognized | $		$ 73,153,000
Acquisitions 2017 [Member] | Goodwill [Member]
Significant Acquisitions and Disposals [Line Items]
Intangible assets amortization period, tax purposes		15 years
Acquisitions 2016 [Member]
Significant Acquisitions and Disposals [Line Items]
Amortizable intangible assets recognized | $				$ 16,670,000
Intangible assets amortization period, tax purposes				15 years
Aggregate USA LLC [Member] | Pending Acquisition [Member]
Significant Acquisitions and Disposals [Line Items]
Cash consideration | $	$ 900,000,000
Aggregates [Member] | Aggregate USA LLC [Member] | Pending Acquisition [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property	32
Aggregates [Member] | Aggregate USA LLC- Aggregates Facilities [Member] | Pending Acquisition [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property	15
Aggregates [Member] | Aggregate USA LLC- Aggregates Rail Distribution Yard [Member] | Pending Acquisition [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property	16
Aggregates [Member] | Aggregate USA LLC- Aggregates Truck Distribution Yard [Member] | Pending Acquisition [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property	1
Aggregates [Member] | Tennessee [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property		1
Aggregates [Member] | Texas [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property				1
Aggregates [Member] | New Mexico [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property		1
Aggregates [Member] | Illinois [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property		2
Asphalt [Member] | New Mexico [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property				1
Asphalt Paving [Member] | Tennessee [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property		1
Rail-connected aggregates operation [Member] | Tennessee [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property		1
Distribution Business Assets [Member] | California [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property		1
Distribution Business Assets [Member] | Georgia [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired | property				1
Contractual Rights In Place [Member] | Acquisitions 2017 [Member]
Significant Acquisitions and Disposals [Line Items]
Intangible assets amortization period, tax purposes		15 years
Contractual Rights In Place [Member] | Acquisitions 2016 [Member]
Significant Acquisitions and Disposals [Line Items]
Amortizable intangible assets recognized | $				$ 15,213,000
Contractual Rights In Place - Straight-Line Method [Member] | Acquisitions 2017 [Member]
Significant Acquisitions and Disposals [Line Items]
Amortizable intangible assets recognized | $		$ 66,630,000
Estimated weighted-average amortization period of intangible assets		18 years 9 months 18 days
Contractual Rights In Place - Straight-Line Method [Member] | Acquisitions 2016 [Member]
Significant Acquisitions and Disposals [Line Items]
Amortizable intangible assets recognized | $				$ 6,798,000
Estimated weighted-average amortization period of intangible assets				20 years
Contractual Rights In Place - Units Of Production [Member] | Acquisitions 2016 [Member]
Significant Acquisitions and Disposals [Line Items]
Estimated weighted-average amortization period of intangible assets				20 years
Contractual Rights In Place - Units Of Sales [Member] | Acquisitions 2017 [Member]
Significant Acquisitions and Disposals [Line Items]
Amortizable intangible assets recognized | $		$ 6,462,000
Estimated weighted-average amortization period of intangible assets		20 years
Contractual Rights In Place - Units Of Sales [Member] | Acquisitions 2016 [Member]
Significant Acquisitions and Disposals [Line Items]
Amortizable intangible assets recognized | $				$ 8,415,000
Noncompetition Agreements [Member] | Acquisitions 2016 [Member]
Significant Acquisitions and Disposals [Line Items]
Amortizable intangible assets recognized | $				$ 1,457,000