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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
Mar. 31, 2020
Dec. 31, 2019
Oct. 01, 2019
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Goodwill   $ 191,892 $ 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      
Estimated tax basis election 5,141      
Total consideration 427,659      
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 liabilities 7,669      
Total net tangible assets 102,398      
Identifiable intangible assets 218,600      
Goodwill 106,661      
Total consideration transferred $ 427,659