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Acquisitions - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]            
Contingent consideration, maximum $ 153,000,000.0   $ 153,000,000.0   $ 153,000,000.0  
Net tangible assets acquired 49,100,000   49,100,000   49,100,000  
Other intangible assets acquired         39,900,000  
Goodwill acquired     21,909,000   35,800,000 $ 56,337,000
Bargain purchase gain, net of deferred tax 3,138,000 $ 0 3,138,000 $ 0    
Acquisitions 2019            
Business Acquisition [Line Items]            
Cash consideration     53,345,000      
Value of Quanta common stock issued     0      
Fair value of contingent consideration liability 0   0   0  
Other intangible assets acquired     7,337,000      
Goodwill acquired     21,909,000      
Bargain purchase gain, net of deferred tax     3,139,000      
Goodwill expected to be deductible for income tax 0   0   $ 0  
Revenues included in consolidated results of operations 14,300,000   21,700,000      
Income (loss) before taxes 5,100,000   4,100,000      
Acquisition costs $ 0   $ 2,400,000      
Acquisitions 2018            
Business Acquisition [Line Items]            
Cash consideration           $ 108,307,000
Number of shares granted for acquired companies (in shares)           679,668
Value of Quanta common stock issued           $ 22,882,000
Contingent consideration, maximum           18,000,000.0
Fair value of contingent consideration liability           16,471,000
Goodwill acquired           57,840,000
Bargain purchase gain, net of deferred tax           0
Goodwill expected to be deductible for income tax           $ 21,600,000
Revenues included in consolidated results of operations   11,200,000   19,300,000    
Income (loss) before taxes   (1,300,000)   (6,600,000)    
Acquisition costs   $ 400,000   $ 6,000,000.0    
Acquisitions 2018 | Minimum            
Business Acquisition [Line Items]            
Contingent consideration financial target term           3 years
Acquisitions 2018 | Maximum            
Business Acquisition [Line Items]            
Contingent consideration financial target term           5 years