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Acquisitions - Summary of Acquisition by Acquisition (Details) - USD ($) $ in Thousands |  | 18 Months Ended |
--- | --- | --- | ---
Jul. 15, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 66,065 | $ 66,060
CSI Electrical Contractors, Inc |  |  |
Business Acquisition [Line Items] |  |  |
Consideration paid | $ 79,720 | 79,720 |
Measurement Period Adjustments, Consideration paid |  | 0 |
Net asset adjustments | 633 | 987 |
Measurement Period Adjustments, Net asset adjustments |  | 354 |
Total consideration, net of net asset adjustments | 80,353 | 80,707 |
Measurement Period Adjustments, Total consideration. net of net asset adjustments |  | 354 |
Accounts receivable, net | 59,579 | 59,765 |
Measurement Period Adjustments, Accounts receivable, net |  | 186 |
Contract assets | 38,970 | 39,964 |
Measurement Period Adjustments, Contract assets |  | 994 |
Other current assets | 83 | 83 |
Measurement Period Adjustments, Other current assets |  | 0 |
Property and equipment | 7,964 | 7,964 |
Measurement Period Adjustments, Property and equipment |  | 0 |
Operating lease right-of-use assets | 9,933 | 9,933 |
Measurement Period Adjustments, Operating lease right-of-use assets |  | 0 |
Intangible assets | 26,000 | 25,500 |
Measurement Period Adjustments, Intangible assets |  | (500) |
Other long term assets | 149 | 149 |
Measurement Period Adjustments, Other long term assets |  | 0 |
Accounts payable | (29,533) | (30,633) |
Measurement Period Adjustments, Accounts payable |  | (1,100) |
Accrued salaries and benefits | (8,091) | (8,091) |
Measurement Period Adjustments, Accrued salaries and benefits |  | 0 |
Contract liabilities | (18,934) | (18,734) |
Measurement Period Adjustments, Contract liabilities |  | 200 |
Current portion of operating lease obligations | (2,526) | (2,562) |
Measurement Period Adjustments, Current portion of operating lease obligations |  | (36) |
Other current liabilities | (4,776) | (4,703) |
Measurement Period Adjustments, Other current liabilities |  | 73 |
Operating lease obligations, net of current maturities | (7,407) | (7,371) |
Measurement Period Adjustments, Operating lease obligations, net of current maturities |  | 36 |
Long-term debt | (20) | (20) |
Measurement Period Adjustments, Long-term debt |  | 0 |
Net identifiable assets and liabilities | 71,391 | 71,244 |
Measurement Period Adjustments, Net identifiable assets and liabilities |  | (147) |
Goodwill | $ 8,962 | 9,463 |
Measurement Period Adjustments, Goodwill |  | $ 501 |

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