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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Contract revenues	$ 269,861	$ 248,473	$ 790,497	$ 692,988
Income from operations	9,919	13,407	34,540	35,934
T&D [Member]
Segment Reporting Information [Line Items]
Contract revenues	203,864	179,960	593,670	508,385
Income from operations	13,929	16,892	47,476	47,636
C&I [Member]
Segment Reporting Information [Line Items]
Contract revenues	65,997	68,513	196,827	184,603
Income from operations	2,780	5,427	9,540	13,149
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (6,790)	$ (8,912)	$ (22,476)	$ (24,851)

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1(d))



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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