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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Contract revenues $ 607,970 $ 607,901 $ 513,051 $ 518,470 $ 571,075 $ 583,214 $ 448,776 $ 468,094 $ 2,247,392 $ 2,071,159 $ 1,531,169
Income from operations                 86,545 57,178 50,312
General Corporate                      
Segment Reporting Information [Line Items]                      
Income from operations                 (60,089) (46,908) (41,042)
T&D                      
Segment Reporting Information [Line Items]                      
Contract revenues                 1,154,378 1,134,411 893,108
T&D | Operating Segments                      
Segment Reporting Information [Line Items]                      
Income from operations                 109,387 73,580 57,242
C&I                      
Segment Reporting Information [Line Items]                      
Contract revenues                 1,093,014 936,748 638,061
C&I | Operating Segments                      
Segment Reporting Information [Line Items]                      
Income from operations                 $ 37,247 $ 30,506 $ 34,112