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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]            
Net tangible assets acquired $ 106,000   $ 106,000   $ 106,000  
Other intangible assets acquired         80,700  
Goodwill acquired     78,125   89,100 $ 110,383
Bargain purchase gain, net of deferred tax           3,100
Acquisitions 2020            
Business Acquisition [Line Items]            
Cash consideration     $ 220,572      
Number of shares granted for acquired companies (in shares)     1,204,586      
Value of Quanta common stock issued     $ 49,690      
Other intangible assets acquired     77,734      
Goodwill acquired     78,125      
Bargain purchase gain, net of deferred tax     0      
Goodwill expected to be deductible for income tax 71,800   71,800   $ 71,800  
Revenues included in consolidated results of operations 55,200   63,000      
Income (loss) before taxes 1,000   1,000      
Acquisition costs $ 10,600   11,400      
Acquisitions 2019            
Business Acquisition [Line Items]            
Cash consideration     $ 395,300     395,258
Number of shares granted for acquired companies (in shares)     60,860      
Value of Quanta common stock issued     $ 1,800     1,791
Goodwill acquired           112,132
Bargain purchase gain, net of deferred tax           3,139
Goodwill expected to be deductible for income tax           $ 82,100
Revenues included in consolidated results of operations   $ 56,700   $ 78,400    
Income (loss) before taxes   (10,100)   (6,000)    
Acquisition costs   $ 17,000   $ 19,400