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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Contract revenues	$ 345,611	$ 300,129
Income from operations	8,407	480
T&D [Member]
Segment Reporting Information [Line Items]
Contract revenues	216,386	195,734
Income from operations	13,541	5,142
C&I [Member]
Segment Reporting Information [Line Items]
Contract revenues	129,225	104,395
Income from operations	5,336	4,414
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (10,470)	$ (9,076)

X

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The net result for the period of deducting operating expenses from operating revenues.

+ References

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- Definition

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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