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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Contract revenues	$ 343,660	$ 283,259	$ 261,934	$ 253,634	$ 271,184	$ 269,861	$ 276,488	$ 244,148	$ 1,142,487	$ 1,061,681	$ 943,967
Income from operations									38,754	44,841	58,404
T&D [Member]
Segment Reporting Information [Line Items]
Contract revenues									818,972	794,898	699,595
Income from operations									63,459	63,155	75,439
C&I [Member]
Segment Reporting Information [Line Items]
Contract revenues									323,515	266,783	244,372
Income from operations									13,920	13,592	16,542
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations									$ (38,625)	$ (31,906)	$ (33,577)

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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=63488584&loc=d3e20235-122688

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