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Acquisitions (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 01, 2020
Dec. 31, 2020
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Consideration transferred:            
Total consideration transferred       $ 41,600 $ 2,600  
Recognized amounts of identifiable assets acquired and liabilities assumed:            
Goodwill   $ 464,392   464,392 $ 332,447 $ 235,182
TAS Energy            
Consideration transferred:            
Cash paid at closing $ 105,950          
Working capital adjustment 40,455          
Notes issued to former owners 14,000          
Estimated fair value of contingent earn-out payments 9,100          
Total consideration transferred 169,505          
Recognized amounts of identifiable assets acquired and liabilities assumed:            
Cash and cash equivalents 47,460          
Billed and unbilled accounts receivable 18,702          
Other current assets 15,634          
Other long-term assets 1,556          
Property and equipment 7,709          
Goodwill 72,788          
Identifiable intangible assets 53,400          
Lease right-of-use asset 19,736          
Accounts payable (16,453)          
Billings in excess of costs and estimated earnings (24,196)          
Current lease liabilities (2,337)          
Accrued expenses and other current liabilities (4,109)          
Long-term lease liabilities (17,398)          
Other long-term liabilities (2,987)          
Total assets acquired and liabilities assumed $ 169,505          
T E C Industrial Construction and Maintenance            
Consideration transferred:            
Cash paid at closing   73,000        
Working capital adjustment   2,006        
Notes issued to former owners   7,000        
Estimated fair value of contingent earn-out payments   7,560        
Total consideration transferred   89,566        
Recognized amounts of identifiable assets acquired and liabilities assumed:            
Cash and cash equivalents   4   4    
Billed and unbilled accounts receivable   13,660   13,660    
Costs in excess of billings   2,040   2,040    
Other current assets   108   108    
Other long-term assets   53   53    
Property and equipment   912   912    
Goodwill   44,431   44,431    
Identifiable intangible assets   37,200   37,200    
Lease right-of-use asset   1,234   1,234    
Accounts payable   (4,123)   (4,123)    
Billings in excess of costs and estimated earnings   (2,838)   (2,838)    
Current lease liabilities   (175)   (175)    
Accrued expenses and other current liabilities   (1,881)   (1,881)    
Long-term lease liabilities   (1,059)   (1,059)    
Total assets acquired and liabilities assumed   $ 89,566   $ 89,566    
Walker            
Consideration transferred:            
Cash paid at closing     $ 178,000      
Working capital adjustment     7,800      
Notes issued to former owners     25,000      
Total consideration transferred     235,400      
Recognized amounts of identifiable assets acquired and liabilities assumed:            
Total assets acquired and liabilities assumed     $ 187,000