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Plateau Acquisition - Consideration Transferred and Purchase Price Allocation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Oct. 02, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 01, 2019
Business Combination, Consideration Transferred [Abstract]          
Share consideration given for acquisitions   $ 16,195 $ 0 $ 17,601  
Estimated tax basis election $ 5,141   0 $ 0  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]          
Goodwill   $ 191,892 $ 85,231    
Plateau          
Business Combination, Consideration Transferred [Abstract]          
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        
Sellers Note 10,000        
Estimated tax basis election 5,141        
Total consideration 427,659        
Cash acquired $ 2,425        
Shares issued in acquisition of business (in shares) 1,245        
Business acquisition share price         $ 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        
Preliminary identifiable intangible assets 218,600        
Goodwill 106,661        
Total consideration transferred $ 427,659