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ACQUISITIONS AND DIVESTITURES (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
property
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
property
Significant Acquisitions and Disposals [Line Items]      
Cash consideration $ 185,067,000 $ 1,611,000 $ 32,537,000
Total consideration 185,067,000   33,287,000
Consideration payable amount     750,000
Goodwill of acquired businesses [1] 6,417,000    
Assets held for sale 0 $ 0 0
Acquisitions 2017 [Member]      
Significant Acquisitions and Disposals [Line Items]      
Amortizable intangible assets recognized $ 62,885,000    
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
Aggregates [Member]      
Significant Acquisitions and Disposals [Line Items]      
Goodwill of acquired businesses [1] $ 6,417,000    
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
Concrete [Member]      
Significant Acquisitions and Disposals [Line Items]      
Goodwill of acquired businesses [1] $ 0    
Asphalt Mix [Member]      
Significant Acquisitions and Disposals [Line Items]      
Goodwill of acquired businesses [1] $ 0    
Asphalt Mix [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 $ 62,824,000    
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]      
Amortizable intangible assets recognized     $ 8,415,000
Estimated weighted-average amortization period of intangible assets     20 years
Noncompetition Agreements [Member] | Acquisitions 2016 [Member]      
Significant Acquisitions and Disposals [Line Items]      
Amortizable intangible assets recognized     $ 1,457,000
[1] See Note 16 for a summary of the current year acquisitions.