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Goodwill and Intangible Assets - Summary of goodwill and intangible assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Goodwill gross carrying amount | $ 56,588 | $ 46,994
Goodwill accumulated amortization | 0 | 0
Goodwill net carrying amount | 56,588 | 46,994
Accumulated Amortization | 7,031 | 5,183
Total | 13,733 |
Intangible Assets, Gross (Excluding Goodwill) | 40,297 | 16,035
Intangible Assets, Net (Excluding Goodwill) | 33,266 | 10,852
Trade names [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Indefinite-lived Intangible Assets | 19,533 | 9,074
Intangible Assets, Gross (Excluding Goodwill) | 0 | 0
Intangible Assets, Net (Excluding Goodwill) | 19,533 | 9,074
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 | 16,364 | 6,770
Goodwill accumulated amortization | 0 | 0
Goodwill net carrying amount | 16,364 | 6,770
Backlog [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Accumulated Amortization | 1,889 | 989
Amortizable intangible assets gross carrying amount | 2,789 | 989
Total | 900 | 0
Customer relationships [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Accumulated Amortization | 4,970 | 4,069
Amortizable intangible assets gross carrying amount | 17,280 | 5,277
Total | 12,310 | 1,208
Trade names [Member] |  |
Schedule Of Intangible Assets And Goodwill [Line Items] |  |
Accumulated Amortization | 172 | 125
Amortizable intangible assets gross carrying amount | 695 | 695
Total | $ 523 | $ 570

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