Segments and Related Information (Schedule of Segment Reporting Information, by Segment - Revenue) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenue	$ 1,159,100	$ 1,269,400	$ 977,600	$ 918,600	$ 932,400	$ 1,067,300	$ 988,900	$ 738,300	$ 4,324,787	$ 3,726,789	$ 2,831,292
Operating Segments [Member] | Communications [Member]
Segment Reporting Information [Line Items]
Revenue									1,962,600	1,772,700	1,635,100
Operating Segments [Member] | Oil and Gas [Member]
Segment Reporting Information [Line Items]
Revenue									1,628,800	959,000	774,300
Operating Segments [Member] | Electrical Transmission [Member]
Segment Reporting Information [Line Items]
Revenue									428,800	312,200	198,300
Operating Segments [Member] | Power Generation and Industrial [Member]
Segment Reporting Information [Line Items]
Revenue									294,300	668,100	219,600
Operating Segments [Member] | Other Segments [Member]
Segment Reporting Information [Line Items]
Revenue									12,300	16,700	4,800
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue									$ (2,000)	$ (1,900)	$ (800)