Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Narrative (Details)

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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]        
Net tangible assets acquired $ 217,500   $ 217,500  
Identified intangible assets     92,700  
Goodwill acquired 1,780   75,800 $ 86,197
Acquisitions 2021        
Business Acquisition [Line Items]        
Cash consideration 3,500      
Value of quanta common stock issued 0      
Contingent consideration 0   0  
Identified intangible assets 393      
Goodwill acquired 1,780      
Goodwill expected to be deductible for income tax $ 1,800   $ 1,800  
Acquisitions 2020        
Business Acquisition [Line Items]        
Cash consideration       $ 349,310
Number of shares granted for acquired companies (in shares)       1,334,469
Value of quanta common stock issued       $ 57,119
Aggregate maximum payout amount       $ 6,900
Aggregate maximum payout amount, target term       5 years
Contingent consideration       $ 2,250
Goodwill acquired       84,934
Goodwill expected to be deductible for income tax       $ 73,300
Revenues included in consolidated results of operations   $ 1,900    
Income (loss) before taxes   (900)    
Acquisition costs   $ 800