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Acquisitions - Summary of acquisition by acquisition (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended 18 Months Ended
Jul. 15, 2019
Jul. 02, 2018
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]            
Goodwill     $ 66,060 $ 66,060 $ 66,060 $ 56,588
CSI Electrical Contractors, Inc [Member]            
Business Acquisition [Line Items]            
Consideration paid $ 79,720     79,720    
Net asset adjustments 633     987    
Total consideration, net of net asset adjustments 80,353     80,707    
Accounts receivable, net 59,579   59,765 59,765 59,765  
Contract assets 38,970   39,964 39,964 39,964  
Other current assets 83   83 83 83  
Property and equipment 7,964   7,964 7,964 7,964  
Operating lease right-of-use assets 9,933   9,933 9,933 9,933  
Intangible assets 26,000   25,500 25,500 25,500  
Other long term assets 149   149 149 149  
Accounts payable (29,533)   (30,633) (30,633) (30,633)  
Accrued salaries and benefits (8,091)   (8,091) (8,091) (8,091)  
Contract liabilities (18,934)   (18,734) (18,734) (18,734)  
Current portion of operating lease obligations (2,526)   (2,562) (2,562) (2,562)  
Other current liabilities (4,776)   (4,703) (4,703) (4,703)  
Operating lease obligations, net of current maturities (7,407)   (7,371) (7,371) (7,371)  
Long-term debt (20)   (20) (20) (20)  
Net identifiable assets and liabilities 71,391   71,244 71,244 71,244  
Goodwill $ 8,962   9,463 9,463 9,463  
Consideration paid     0      
Net asset adjustments     354      
Total consideration, net of net asset adjustments     354      
Accounts receivable, net     186      
Contract assets     994      
Other current and long term assets     0      
Property and equipment     0      
Operating lease right-of-use assets     0      
Intangible assets     (500)      
Other long term assets     0      
Accounts payable     (1,100)      
Accrued salaries and benefits     0      
Contract liabilities     200      
Current portion of operating lease obligations, Measurement Period Adjustments     (36)      
Other current liabilities     73      
Operating lease obligations, net of current maturities, Measurement Period Adjustments     36      
Net identifiable assets and liabilities     (147)      
Unallocated intangible assets     0      
Goodwill     501      
Huen Electric Inc [Member]            
Business Acquisition [Line Items]            
Consideration paid   $ 47,082     47,082  
Net asset adjustments   10,749     10,834  
Total consideration, net of net asset adjustments   57,831     57,916  
Accounts receivable, net   33,903 33,696 33,696 33,696  
Contract assets   10,570 11,580 11,580 11,580  
Other current and long term assets   88 77 77 77  
Property and equipment   3,188 3,188 3,188 3,188  
Intangible assets   0 24,300 24,300 24,300  
Accounts payable   (9,592) (10,866) (10,866) (10,866)  
Contract liabilities   (6,394) (5,869) (5,869) (5,869)  
Other current liabilities   (6,570) (6,521) (6,521) (6,521)  
Net identifiable assets and liabilities   25,193 49,585 49,585 49,585  
Unallocated intangible assets   9,800 0 0 0  
Total acquired assets and liabilities   34,993 49,585 49,585 49,585  
Fair value of acquired noncontrolling interest   (1,273) (1,280) (1,280) (1,280)  
Goodwill   $ 24,111 $ 9,611 $ 9,611 9,611  
Consideration paid         0  
Net asset adjustments         85  
Total consideration, net of net asset adjustments         85  
Accounts receivable, net         (207)  
Contract assets         1,010  
Other current and long term assets         (11)  
Property and equipment         0  
Intangible assets         24,300  
Accounts payable         (1,274)  
Contract liabilities         525  
Other current liabilities         49  
Net identifiable assets and liabilities         24,392  
Unallocated intangible assets         (9,800)  
Total acquired assets and liabilities         14,592  
Fair value of acquired noncontrolling interest         (7)  
Goodwill         $ (14,500)