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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]            
Net tangible assets acquired $ 76,700   $ 76,700   $ 76,700  
Other intangible assets acquired         190,000  
Goodwill acquired     10,069   102,700 $ 110,383
Bargain purchase gain, net of deferred tax           3,100
Acquisitions 2020            
Business Acquisition [Line Items]            
Cash consideration     $ 19,377      
Number of shares granted for acquired companies (in shares)     116,812      
Value of Quanta common stock issued     $ 4,158      
Other intangible assets acquired     4,561      
Goodwill acquired     10,069      
Bargain purchase gain, net of deferred tax     0      
Goodwill expected to be deductible for income tax 3,800   3,800   $ 3,800  
Revenues included in consolidated results of operations 5,900   7,800      
Income (loss) before taxes 900          
Acquisition costs $ 0   $ 800      
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           $ 1,791
Goodwill acquired           112,173
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   $ 14,300   21,700    
Income (loss) before taxes   5,100   4,100    
Acquisition costs   $ 0   $ 2,400