Restructuring - Restructuring Costs by Segment (Details) (Restructuring Plan 2014 [Member], Infrastructure Solutions [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	$ 3,538
Severance and benefit costs [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	516
Lease termination costs [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	141
Bad debt expense [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	(999)
Currency tranlation [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	409
Other restructuring costs [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax charges related to restructuring	$ 3,471