Information by Segment and Geographic Area (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue from External Customer [Line Items]
Consolidated Revenues	$ 1,451,223	$ 1,723,092	$ 2,066,288
Outsourced, on-site services to steel mills and other metals producers and resource recovery technologies for the re-use of industrial waste stream by-products
Revenue from External Customer [Line Items]
Consolidated Revenues	965,540	1,106,162	1,378,142
Railway track maintenance services and equipment
Revenue from External Customer [Line Items]
Consolidated Revenues	238,107	259,674	275,614
Air-cooled heat exchangers
Revenue from External Customer [Line Items]
Consolidated Revenues	115,914	129,869	139,711
Industrial grating products
Revenue from External Customer [Line Items]
Consolidated Revenues	93,616	186,243	226,529
Heat transfer products
Revenue from External Customer [Line Items]
Consolidated Revenues	$ 38,012	$ 41,144	$ 46,292