Segments and Operations by Geographic Area (Schedule of Significant Customers, Revenue Concentration) (Details) (Reportable Segments [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Communications [Member] | AT&T [Member]
Segment Reporting Information [Line Items]
Segment reporting, disclosure of major customers			The Company's relationship with AT&T is based upon master service agreements, other service agreements and construction/installation contracts for both AT&T's wireless and wireline infrastructure businesses. Revenue from AT&T is included in the Communications segment.
Communications [Member] | DIRECTV[Member]
Segment Reporting Information [Line Items]
Segment reporting, disclosure of major customers			The Company's relationship with DIRECTV® is based upon an agreement to provide installation and maintenance services for DIRECTV®. Revenue from DIRECTV® is included in the Communications segment.
Oil and Gas [Member] | Enbridge [Member]
Segment Reporting Information [Line Items]
Segment reporting, disclosure of major customers			The Company's relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment.
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | Continuing Operations [Member] | Communications [Member] | AT&T [Member]
Segment Reporting Information [Line Items]
Entity-wide revenue, major customer, percentage	16.00%	17.00%	18.00%	17.00%
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | Continuing Operations [Member] | Communications [Member] | DIRECTV[Member]
Segment Reporting Information [Line Items]
Entity-wide revenue, major customer, percentage	13.00%	16.00%	15.00%	17.00%
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | Continuing Operations [Member] | Oil and Gas [Member] | Enbridge [Member]
Segment Reporting Information [Line Items]
Entity-wide revenue, major customer, percentage	20.00%	3.00%	14.00%	1.00%