ACQUISITIONS AND DISPOSITIONS - Purchase of Bode Gravel and Bode Concrete Equity Interests (Details) (Bode Gravel and Bode Concrete LLC, USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Oct. 30, 2012 Processing_Facility Portable_Processing_Facility Mixer_Truck	Dec. 31, 2011 cubic_yard
Bode Gravel and Bode Concrete LLC
Business Acquisition [Line Items]
Number of plants acquired	2
Number of portable plants acquired	1
Number of mixer trucks	41
Ready-mix concrete (in cubic yards)		243,000
Cash paid on acquisition	$ 24.5
Post-closing adjustments	1.6
Accrual for total contingent consideration	7.0
Business Combination, Contingent Consideration, Term of Liability	6 years
Total consideration transferred	$ 33.1