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Segment Information - Summary of segment's internal financial reports (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Contract revenues	$ 518,470	$ 468,094
Income from operations	16,408	9,626
T&D [Member]
Segment Reporting Information [Line Items]
Contract revenues	259,270	272,548
Income from operations	17,964	14,930
C&I [Member]
Segment Reporting Information [Line Items]
Contract revenues	259,200	195,546
Income from operations	9,312	5,058
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (10,868)	$ (10,362)

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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