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Plateau Acquisition - Consideration Transferred and Purchase Price Allocation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
Oct. 02, 2019
Sep. 30, 2020
Dec. 31, 2019
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]      
Goodwill   $ 192,014 $ 191,892
Plateau Excavation      
Business Acquisition [Line Items]      
Cash consideration transferred, net of $2,425 of cash acquired $ 375,000    
Target working capital adjustment 21,323    
Share consideration given for acquisitions 16,195    
Note payable to seller 10,000    
Tax basis election 5,015    
Total consideration 427,533    
Cash acquired $ 2,425    
Equity consideration transferred (in shares) 1,245    
Business acquisition, price per share $ 13.01    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]      
Accounts receivable, including retainage $ 81,921    
Costs and estimated earnings in excess of billings 974    
Other current assets 249    
Property and equipment, net 65,492    
Other non-current assets, net 10    
Accounts payable (22,039)    
Billings in excess of costs and estimated earnings (16,540)    
Other current and non-current liabilities (7,918)    
Total net tangible assets 102,149    
Identifiable intangible assets 218,600    
Goodwill 106,784    
Total consideration transferred $ 427,533