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ACQUISITIONS AND DIVESTITURES (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
property
Dec. 31, 2015
USD ($)
property
Significant Acquisitions and Disposals [Line Items]            
Consideration transferred, net of assets divested       $ 793,523    
Total consideration       1,080,815 $ 33,287 $ 47,198
Cash consideration       1,109,725 32,537 27,198
Consideration payable amount         750 20,000
Goodwill       27,497 [1]  
Proceeds from sale of property, plant & equipment       15,756 23,318 8,218
Gain on sale of property, plant & equipment and businesses       17,827 15,431 $ 9,927
Aggregates USA [Member]            
Significant Acquisitions and Disposals [Line Items]            
Amount of assets divested $ 287,292     287,292    
Gain on sale of property, plant & equipment and businesses 0          
Virginia Plant Relocation [Member]            
Significant Acquisitions and Disposals [Line Items]            
Proceeds from sale of property, plant & equipment   $ 6,000        
Gain on sale of property, plant & equipment and businesses   4,335        
Acquisitions 2017 [Member]            
Significant Acquisitions and Disposals [Line Items]            
Amortizable intangible assets recognized       $ 309,112    
Intangible assets amortization period, tax purposes       15 years    
Goodwill, deductible for income tax purposes 27,497     $ 27,497    
Acquisitions 2016 [Member]            
Significant Acquisitions and Disposals [Line Items]            
Amortizable intangible assets recognized         16,670  
Acquisitions 2015 [Member]            
Significant Acquisitions and Disposals [Line Items]            
Amortizable intangible assets recognized         17,734  
Immaterial Business Acquisitions [Member]            
Significant Acquisitions and Disposals [Line Items]            
Total consideration       48,490    
Cash consideration       36,746    
Consideration payable amount       1,844    
Assets acquired 9,900     9,900    
Arizona [Member]            
Significant Acquisitions and Disposals [Line Items]            
Gain on sale of property, plant & equipment and businesses 8,021          
Assets divested, fair value 9,900     9,900    
Assets divested, book value $ 1,879     1,879    
California [Member] | California ready-mixed concrete operations [Member]            
Significant Acquisitions and Disposals [Line Items]            
Gain on sale of property, plant & equipment and businesses     $ 5,886      
California And Virginia [Member]            
Significant Acquisitions and Disposals [Line Items]            
Proceeds from sale of property, plant & equipment   19,185        
Gain on sale of property, plant & equipment and businesses   $ 11,871        
Aggregates [Member]            
Significant Acquisitions and Disposals [Line Items]            
Goodwill       $ 27,497 [1]  
Aggregates [Member] | Tennessee [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property           1
Aggregates [Member] | Tennessee [Member] | Immaterial Business Acquisitions [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property       1    
Aggregates [Member] | Arizona and New Mexico [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property           3
Aggregates [Member] | Texas [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property         1  
Aggregates [Member] | New Mexico [Member] | Immaterial Business Acquisitions [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property       1    
Aggregates [Member] | Virginia [Member] | Immaterial Business Acquisitions [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property       1    
Aggregates [Member] | Georgia [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property       3    
Aggregates [Member] | Illinois [Member] | Immaterial Business Acquisitions [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property       2    
Concrete [Member]            
Significant Acquisitions and Disposals [Line Items]            
Goodwill       $ 0 [1]  
Concrete [Member] | Arizona and New Mexico [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property           7
Concrete [Member] | California [Member] | California ready-mixed concrete operations [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities divested | property           12
Concrete [Member] | Virginia [Member] | Immaterial Business Acquisitions [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property       1    
Asphalt [Member]            
Significant Acquisitions and Disposals [Line Items]            
Goodwill       $ 0 [1]  
Asphalt [Member] | Arizona [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property           13
Asphalt [Member] | Arizona [Member] | Immaterial Business Acquisitions [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property       1    
Asphalt [Member] | New Mexico [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] | Florida [Member]            
Significant Acquisitions and Disposals [Line Items]            
Number of facilities acquired | property       1    
Distribution Business Assets [Member] | South Carolina [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       14 1  
Construction Paving [Member] | Tennessee [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  
Intangible assets amortization period, tax purposes       15 years    
Contractual Rights In Place [Member] | Acquisitions 2015 [Member]            
Significant Acquisitions and Disposals [Line Items]            
Amortizable intangible assets recognized         17,484  
Intangible assets amortization period, tax purposes       15 years    
Contractual Rights In Place - Straight-Line Method [Member] | Acquisitions 2017 [Member]            
Significant Acquisitions and Disposals [Line Items]            
Amortizable intangible assets recognized       $ 73,879    
Estimated weighted-average amortization period of intangible assets       19 years 3 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  
Estimated weighted-average amortization period of intangible assets       20 years    
Contractual Rights In Place - Straight-Line Method [Member] | Acquisitions 2015 [Member]            
Significant Acquisitions and Disposals [Line Items]            
Amortizable intangible assets recognized         7,168  
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       $ 235,133    
Estimated weighted-average amortization period of intangible assets       54 years 8 months 12 days    
Contractual Rights In Place - Units Of Sales [Member] | Acquisitions 2016 [Member]            
Significant Acquisitions and Disposals [Line Items]            
Amortizable intangible assets recognized         8,415  
Estimated weighted-average amortization period of intangible assets       20 years    
Contractual Rights In Place - Units Of Sales [Member] | Acquisitions 2015 [Member]            
Significant Acquisitions and Disposals [Line Items]            
Amortizable intangible assets recognized         10,317  
Estimated weighted-average amortization period of intangible assets       34 years    
Noncompetition Agreements [Member] | Acquisitions 2016 [Member]            
Significant Acquisitions and Disposals [Line Items]            
Amortizable intangible assets recognized         1,457  
Noncompetition Agreements [Member] | Acquisitions 2015 [Member]            
Significant Acquisitions and Disposals [Line Items]            
Amortizable intangible assets recognized         $ 250  
[1] See Note 19 for a summary of the current year acquisitions