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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2017	[1]	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	[1]	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Contract revenues	$ 373,501		$ 373,502	$ 356,185	$ 300,129	$ 343,660		$ 283,259	$ 261,934	$ 253,634	$ 1,403,317	$ 1,142,487	$ 1,061,681
Income from operations											29,558	38,754	44,841
T&D [Member]
Segment Reporting Information [Line Items]
Contract revenues											879,372	818,972	794,898
Income from operations											39,631	63,459	63,155
C&I [Member]
Segment Reporting Information [Line Items]
Contract revenues											523,945	323,515	266,783
Income from operations											25,048	13,920	13,592
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations											$ (35,121)	$ (38,625)	$ (31,906)
[1] Results for the fourth quarter of 2017 include a net Tax Act benefit of $7.8 million, or $0.48 and $0.47 per basic and diluted share, respectively. See further discussion in Note 10 — Income Taxes to our Financial Statements.

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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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