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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 item | Mar. 31, 2013
Segment Information |  |
Number of reporting segments | 2 |
Segment contract revenues and operating income (loss) |  |
Contract revenues | $ 215,638 | $ 201,342
Operating income (loss) | 10,132 | 11,390
General Corporate |  |
Segment contract revenues and operating income (loss) |  |
Operating income (loss) | (7,197) | (8,030)
T&D |  |
Segment contract revenues and operating income (loss) |  |
Contract revenues | 162,044 | 160,532
T&D | Operating segment |  |
Segment contract revenues and operating income (loss) |  |
Operating income (loss) | 13,962 | 16,694
C&I |  |
Segment contract revenues and operating income (loss) |  |
Contract revenues | 53,594 | 40,810
C&I | Operating segment |  |
Segment contract revenues and operating income (loss) |  |
Operating income (loss) | $ 3,367 | $ 2,726

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