Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details)

v3.19.1
Acquisitions (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 24, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Contingent consideration, maximum   $ 157,300,000   $ 157,300,000  
Net tangible assets acquired   43,600,000   43,600,000  
Other intangible assets acquired       39,900,000  
Goodwill acquired   21,909,000   34,300,000 $ 56,337,000
Acquisitions 2019          
Business Acquisition [Line Items]          
Cash consideration for the acquisition $ 50,900,000        
Cash consideration   50,907,000      
Value of Quanta common stock issued   0      
Fair value of contingent consideration liability   0   0  
Other intangible assets acquired   7,337,000      
Goodwill acquired   21,909,000      
Goodwill expected to be deductible for income tax   0   $ 0  
Revenues included in consolidated results of operations   7,400,000      
Income (loss) before taxes   (1,000,000.0)      
Acquisition costs   $ 2,400,000      
Acquisitions 2018          
Business Acquisition [Line Items]          
Cash consideration         $ 106,804,000
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         56,337,000
Goodwill expected to be deductible for income tax         $ 20,100,000
Revenues included in consolidated results of operations     $ 8,100,000    
Income (loss) before taxes     (5,300,000)    
Acquisition costs     $ 5,600,000    
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