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Segment Information - Summary of segment's internal financial reports (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Contract revenues	$ 448,776	$ 339,676	$ 916,870	$ 685,287
Income from operations	9,410	10,357	19,036	18,764
T&D [Member]
Segment Reporting Information [Line Items]
Contract revenues	255,910	196,925	528,458	413,311
Income from operations	16,050	11,018	30,980	24,559
C&I [Member]
Segment Reporting Information [Line Items]
Contract revenues	192,866	142,751	388,412	271,976
Income from operations	4,512	9,635	9,570	14,971
GeneralCorporate [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (11,152)	$ (10,296)	$ (21,514)	$ (20,766)

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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