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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Contract revenues:	$ 261,934	$ 276,488	$ 515,568	$ 520,636
Income from operations:	9,142	13,024	12,449	24,621
T&D [Member]
Segment Reporting Information [Line Items]
Contract revenues:	178,629	200,583	361,603	389,806
Income from operations:	15,585	16,713	26,254	33,547
C&I [Member]
Segment Reporting Information [Line Items]
Contract revenues:	83,305	75,905	153,965	130,830
Income from operations:	2,434	3,925	4,590	6,760
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations:	$ (8,877)	$ (7,614)	$ (18,395)	$ (15,686)

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ 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=63488584&loc=d3e20235-122688

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