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Segments and Operations by Geographic Area (Schedule of Segment Reporting Information, by Segment) (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 977,624,000 | $ 988,874,000 | $ 1,896,272,000 | $ 1,727,131,000
Depreciation |  |  | 65,355,000 | 42,946,000
Amortization |  |  | 9,400,000 | 5,700,000
Segment, Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 977,600,000 | 988,900,000 | 1,896,300,000 | 1,727,100,000
EBITDA | 102,700,000 | 82,400,000 | 176,200,000 | 131,500,000
Depreciation | 33,602,000 | 21,763,000 | 65,355,000 | 42,480,000
Amortization | 5,300,000 | 2,800,000 | 9,400,000 | 5,700,000
Segment, Continuing Operations [Member] | Property and Equipment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 28,300,000 | 18,900,000 | 55,900,000 | 36,800,000
Intersegment Elimination [Member] | Segment, Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | (1,200,000) | (100,000) | (2,000,000) | (900,000)
EBITDA | 0 | 100,000 | 0 | 0
Amortization | 0 | 0 | 0 | 0
Intersegment Elimination [Member] | Segment, Continuing Operations [Member] | Property and Equipment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 0 | 0 | 0 | 0
Communications [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 496,600,000 | 431,900,000 | 921,600,000 | 821,000,000
EBITDA | 63,400,000 | 47,000,000 | 109,800,000 | 79,800,000
Amortization | 1,500,000 | 400,000 | 2,600,000 | 900,000
Communications [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] | Property and Equipment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 7,600,000 | 6,800,000 | 14,800,000 | 13,000,000
Oil and Gas [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 296,900,000 | 263,700,000 | 615,700,000 | 431,400,000
EBITDA | 51,200,000 | 15,700,000 | 93,600,000 | 28,300,000
Amortization | 3,000,000 | 500,000 | 5,200,000 | 900,000
Oil and Gas [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] | Property and Equipment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 16,100,000 | 9,000,000 | 32,500,000 | 17,700,000
Electrical Transmission [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 118,600,000 | 88,900,000 | 203,100,000 | 153,300,000
EBITDA | 11,500,000 | 12,100,000 | 14,900,000 | 20,500,000
Amortization | 300,000 | 1,200,000 | 600,000 | 2,600,000
Electrical Transmission [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] | Property and Equipment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 2,500,000 | 1,400,000 | 4,500,000 | 2,800,000
Power Generation and Industrial [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 63,300,000 | 198,300,000 | 152,200,000 | 315,700,000
EBITDA | (8,000,000) | 13,400,000 | (8,200,000) | 18,400,000
Amortization | 500,000 | 700,000 | 1,000,000 | 1,300,000
Power Generation and Industrial [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] | Property and Equipment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 1,200,000 | 1,000,000 | 2,400,000 | 1,900,000
All Other Segments [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 3,400,000 | 6,200,000 | 5,700,000 | 6,600,000
EBITDA | 400,000 | 800,000 | 400,000 | 600,000
Amortization | 0 | 0 | 0 | 0
All Other Segments [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] | Property and Equipment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | 0 | 0 | 0 | 0
Corporate [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
EBITDA | (15,800,000) | (6,700,000) | (34,300,000) | (16,100,000)
Amortization | 0 | 0 | 0 | 0
Corporate [Member] | Reportable Segment [Member] | Segment, Continuing Operations [Member] | Property and Equipment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation | $ 900,000 | $ 700,000 | $ 1,700,000 | $ 1,400,000

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