ACQUISITIONS AND DISPOSITIONS - Purchase of Colorado River Concrete Assets (Details) (USD $)	6 Months Ended			0 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Sep. 14, 2012 West Texas Market - 4 Plants Processing_Facility Market Installments	Jun. 30, 2013 West Texas Market - 4 Plants
Business Acquisition [Line Items]
Number of plants acquired				4
Cash paid on acquisition				$ 2,400,000
Promissory note for ready-mixed conrete plants				1,900,000
Promissory note interest rate				4.50%
Number of equal installments				24
Repayments of Long-term Debt	921,000	949,000			500,000
Number of major markets in which to expand with purchase of assets				2
Acquired value of plant and equipment				3,200,000
Acquired value of inventory				200,000
Acquired value of goodwill	10,526,000		10,717,000	1,000,000
Liabilities assumed				$ 0