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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]              
Contingent consideration, maximum $ 153,000     $ 153,000   $ 153,000  
Net tangible assets acquired 111,800     111,800   111,800  
Other intangible assets acquired           190,800  
Goodwill acquired       97,343   97,300 $ 56,337
Bargain purchase gain, net of deferred tax 0 $ 3,100 $ 0 3,138 $ 0    
Acquisitions 2019              
Business Acquisition [Line Items]              
Cash consideration       $ 395,019      
Number of shares granted for acquired companies (in shares)       60,860      
Value of Quanta common stock issued       $ 1,791      
Fair value of contingent consideration liability 0     0   0  
Other intangible assets acquired       190,785      
Goodwill acquired       97,343      
Bargain purchase gain, net of deferred tax       3,139      
Goodwill expected to be deductible for income tax 77,800     77,800   77,800  
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      
Acquisitions 2018              
Business Acquisition [Line Items]              
Cash consideration             $ 108,307
Number of shares granted for acquired companies (in shares)             679,668
Value of Quanta common stock issued             $ 22,882
Contingent consideration, maximum             18,000
Fair value of contingent consideration liability             16,471
Goodwill acquired             57,840
Bargain purchase gain, net of deferred tax             0
Goodwill expected to be deductible for income tax             $ 21,600
Revenues included in consolidated results of operations     12,900   32,200    
Income (loss) before taxes     (5,100)   (11,700)    
Acquisition costs     $ 5,000   $ 11,000    
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
Hallen              
Business Acquisition [Line Items]              
Fair value of pension plan net liability 5,300     5,300   5,300  
Fair market value of pension plan liabilities acquired 26,500     26,500   26,500  
Fair market value of pension plan assets acquired $ 21,200     $ 21,200   $ 21,200