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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