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Segment Information (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 item | Dec. 31, 2012 | Dec. 31, 2011
Segment Information |  |  |  |  |  |  |  |  |  |  |
Number of reporting segments |  |  |  |  |  |  |  |  | 2 |  |
Segment contract revenues and operating income (loss) |  |  |  |  |  |  |  |  |  |  |
Contract revenues | $ 254,581 | $ 232,890 | $ 213,916 | $ 201,342 | $ 247,763 | $ 250,558 | $ 260,410 | $ 240,228 | $ 902,729 | $ 998,959 | $ 780,356
Income from operations |  |  |  |  |  |  |  |  | 55,617 | 55,762 | 29,629
General Corporate |  |  |  |  |  |  |  |  |  |  |
Segment contract revenues and operating income (loss) |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | (36,219) | (32,345) | (28,257)
T&D |  |  |  |  |  |  |  |  |  |  |
Segment contract revenues and operating income (loss) |  |  |  |  |  |  |  |  |  |  |
Contract revenues |  |  |  |  |  |  |  |  | 722,387 | 828,711 | 622,000
T&D | Operating segment |  |  |  |  |  |  |  |  |  |  |
Segment contract revenues and operating income (loss) |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 81,413 | 80,460 | 52,053
C&I |  |  |  |  |  |  |  |  |  |  |
Segment contract revenues and operating income (loss) |  |  |  |  |  |  |  |  |  |  |
Contract revenues |  |  |  |  |  |  |  |  | 180,342 | 170,248 | 158,356
C&I | Operating segment |  |  |  |  |  |  |  |  |  |  |
Segment contract revenues and operating income (loss) |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | $ 10,423 | $ 7,647 | $ 5,833

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