Segments and Operations by Geographic Area (Schedule of Segment Reporting Information, by Segment) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenue	$ 1,269,385,000	$ 1,067,300,000	$ 3,165,657,000	$ 2,794,431,000
Depreciation			103,111,000	65,767,000
Continuing Operations [Member]
Segment Reporting Information [Line Items]
Revenue	1,269,400,000	1,067,300,000	3,165,700,000	2,794,400,000
EBITDA	132,100,000	91,700,000	308,300,000	223,200,000
Depreciation	37,756,000	22,645,000	103,111,000	65,125,000
Amortization	5,800,000	2,800,000	15,200,000	8,500,000
Continuing Operations [Member] | Property and Equipment [Member]
Segment Reporting Information [Line Items]
Depreciation	32,000,000	19,800,000	87,900,000	56,600,000
Continuing Operations [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
EBITDA	(13,600,000)	(18,400,000)	(47,900,000)	(34,500,000)
Amortization	0	0	0	0
Continuing Operations [Member] | Corporate, Non-Segment [Member] | Property and Equipment [Member]
Segment Reporting Information [Line Items]
Depreciation	900,000	800,000	2,600,000	2,200,000
Continuing Operations [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenue	(100,000)	(700,000)	(2,000,000)	(1,700,000)
EBITDA	0	0	0	0
Amortization	0	0	0	0
Continuing Operations [Member] | Intersegment Elimination [Member] | Property and Equipment [Member]
Segment Reporting Information [Line Items]
Depreciation	0	0	0	0
Continuing Operations [Member] | Communications [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue	543,000,000	490,000,000	1,464,500,000	1,311,100,000
EBITDA	71,800,000	59,500,000	181,600,000	139,400,000
Amortization	1,500,000	400,000	4,000,000	1,300,000
Continuing Operations [Member] | Communications [Member] | Reportable Segments [Member] | Property and Equipment [Member]
Segment Reporting Information [Line Items]
Depreciation	8,000,000	6,900,000	22,800,000	19,900,000
Continuing Operations [Member] | Oil and Gas [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue	519,100,000	284,000,000	1,134,800,000	715,300,000
EBITDA	68,100,000	29,000,000	161,700,000	57,300,000
Amortization	3,200,000	500,000	8,400,000	1,400,000
Continuing Operations [Member] | Oil and Gas [Member] | Reportable Segments [Member] | Property and Equipment [Member]
Segment Reporting Information [Line Items]
Depreciation	19,300,000	9,500,000	51,800,000	27,200,000
Continuing Operations [Member] | Electrical Transmission [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue	118,800,000	74,800,000	321,900,000	228,200,000
EBITDA	12,100,000	10,500,000	27,000,000	31,100,000
Amortization	600,000	1,200,000	1,300,000	3,800,000
Continuing Operations [Member] | Electrical Transmission [Member] | Reportable Segments [Member] | Property and Equipment [Member]
Segment Reporting Information [Line Items]
Depreciation	2,600,000	1,600,000	7,100,000	4,300,000
Continuing Operations [Member] | Power Generation and Industrial [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue	85,100,000	211,700,000	237,300,000	527,400,000
EBITDA	(6,400,000)	9,900,000	(14,600,000)	28,200,000
Amortization	500,000	700,000	1,500,000	2,000,000
Continuing Operations [Member] | Power Generation and Industrial [Member] | Reportable Segments [Member] | Property and Equipment [Member]
Segment Reporting Information [Line Items]
Depreciation	1,200,000	1,000,000	3,600,000	3,000,000
Continuing Operations [Member] | All Other Segments [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Revenue	3,500,000	7,500,000	9,200,000	14,100,000
EBITDA	100,000	1,200,000	500,000	1,700,000
Amortization	0	0	0	0
Continuing Operations [Member] | All Other Segments [Member] | Reportable Segments [Member] | Property and Equipment [Member]
Segment Reporting Information [Line Items]
Depreciation	$ 0	$ 0	$ 0	$ 0