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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Contract revenues	$ 276,488	$ 228,877	$ 520,636	$ 444,515
Income from operations	13,024	12,395	24,621	22,527
T&D [Member]
Segment Reporting Information [Line Items]
Contract revenues	200,583	166,381	389,806	328,425
Income from operations	16,713	16,782	33,547	30,744
C&I [Member]
Segment Reporting Information [Line Items]
Contract revenues	75,905	62,496	130,830	116,090
Income from operations	3,925	4,355	6,760	7,722
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (7,614)	$ (8,742)	$ (15,686)	$ (15,939)

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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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