Acquisitions and Divestitures Details (Textual) (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016 businesses_acquired businesses_divested	Jun. 30, 2016 businesses_acquired businesses_divested	Jun. 30, 2015 USD ($) businesses_divested
Business Acquisition [Line Items]
Divestiture activity	0	0
Acquisition activity | businesses_acquired	0	0
Number of facilities sold			6
Construction Products Group | Texas, Mississippi, and Louisiana [Member] | Galvanizing Business [Member]
Business Acquisition [Line Items]
Gain recognized on disposed facilities | $			$ 7.8