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Segment Information - Summary of segment's internal financial reports (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Contract revenues	$ 571,075	$ 583,214	$ 448,776	$ 468,094	$ 446,345	$ 399,537	$ 339,676	$ 345,611	$ 2,071,159	$ 1,531,169	$ 1,403,317
Income from operations									57,178	50,312	29,558
T&D [Member]
Segment Reporting Information [Line Items]
Contract revenues									1,134,411	893,108	879,372
Income from operations									73,580	57,242	39,631
C&I [Member]
Segment Reporting Information [Line Items]
Contract revenues									936,748	638,061	523,945
Income from operations									30,506	34,112	25,048
General Corporate [Member]
Segment Reporting Information [Line Items]
Income from operations									$ (46,908)	$ (41,042)	$ (35,121)

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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