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Acquisitions - 2017 Acquisitions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 20, 2017
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Contingent consideration payments (up to)   $ 157,200  
Stronghold      
Business Acquisition [Line Items]      
Cash paid or payable $ 351,000    
Number of shares granted for acquired companies (in shares) 2,693,680    
Value of Quanta common stock issued $ 81,300   $ 81,337
Contingent consideration payments (up to) $ 100,000    
Contingent consideration financial target term 3 years    
Fair value of contingent consideration liability $ 51,100   51,084
Other Acquisitions      
Business Acquisition [Line Items]      
Cash paid or payable   $ 12,000  
Number of shares granted for acquired companies (in shares)   288,666  
Value of Quanta common stock issued     8,267
Fair value of contingent consideration liability     $ 0