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Acquisitions - Additional information (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 15, 2019 | Jul. 02, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Jan. 01, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | $ 1,531,169 |  |  |
Income before income taxes |  |  | $ 50,442 | 43,068 | $ 24,640 |  |
Intangible asset amortization |  |  | 3,849 | $ 1,843 | $ 499 |  |
CSI Electrical Contractors, Inc [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Preliminary estimated net asset adjustments | $ 633 |  | 987 |  |  |  |
Total consideration, net of net asset adjustments | $ 80,353 |  | 80,707 |  |  |  |
Acquisition related costs |  |  | 600 |  |  | $ 600 |
Revenues |  |  | 137,700 |  |  |  |
Income before income taxes |  |  | 1,500 |  |  |  |
Intangible asset amortization |  |  | 1,800 |  |  |  |
CSI Electrical Contractors, Inc [Member] | Revolving Credit Facility [Member] | Pro Forma [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Borrowings under line of credit |  |  |  |  |  |  | $ 79,700
CSI Electrical Contractors, Inc [Member] | Margin Guarantee [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in contingent consideration |  |  | 2,000 |  |  |  |
CSI Electrical Contractors, Inc [Member] | Certain Performance Targets and Continued Employment of Key Executives [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in contingent consideration |  |  | 400 |  |  |  |
Huen Electric Inc [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Preliminary estimated net asset adjustments |  | $ 10,749 |  |  |  | 10,834 |
Total consideration, net of net asset adjustments |  | $ 57,831 |  |  |  | $ 57,916 |
Huen Electric Inc [Member] | Margin Guarantee [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in contingent consideration |  |  | 1,500 |  |  |  |
Huen Electric Inc [Member] | Certain Performance Targets and Continued Employment of Key Executives [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Change in contingent consideration |  |  | $ 1,900 |  |  |  |

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