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Goodwill and Intangible Assets - Summary of goodwill and intangible assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Goodwill, Gross Carrying Amount | $ 66,060 | $ 56,588
Goodwill, Accumulated Amortization | 0 | 0
Goodwill, Net Carrying Amount | 66,060 | 56,588
Amortizable Intangible Assets, Accumulated Amortization | 10,880 | 7,031
Amortizable Intangible Assets, Net Carrying Amount | 26,485 |
Total intangible assets, Gross Carrying Amount | 65,820 | 40,297
Total intangible assets, Net Carrying Amount | 54,940 | 33,266
T&D [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Goodwill, Gross Carrying Amount | 40,224 | 40,224
Goodwill, Accumulated Amortization | 0 | 0
Goodwill, Net Carrying Amount | 40,224 | 40,224
C&I [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Goodwill, Gross Carrying Amount | 25,836 | 16,364
Goodwill, Accumulated Amortization | 0 | 0
Goodwill, Net Carrying Amount | 25,836 | 16,364
Trade names [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Indefinite-lived Intangible Assets | 28,455 | 19,533
Backlog [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Amortizable Intangible Assets, Gross Carrying Amount | 5,289 | 2,789
Amortizable Intangible Assets, Accumulated Amortization | 4,039 | 1,889
Amortizable Intangible Assets, Net Carrying Amount | 1,250 | 900
Customer relationships [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Amortizable Intangible Assets, Gross Carrying Amount | 31,381 | 17,280
Amortizable Intangible Assets, Accumulated Amortization | 6,623 | 4,970
Amortizable Intangible Assets, Net Carrying Amount | 24,758 | 12,310
Trade names [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Amortizable Intangible Assets, Gross Carrying Amount | 695 | 695
Amortizable Intangible Assets, Accumulated Amortization | 218 | 172
Amortizable Intangible Assets, Net Carrying Amount | $ 477 | $ 523

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