Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Narrative (Details)

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Acquisitions - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 13, 2021
Oct. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]                
Net tangible assets acquired     $ 136,400   $ 136,400   $ 136,400  
Identified intangible assets             37,600  
Goodwill acquired             35,300  
Subsequent Event                
Business Acquisition [Line Items]                
Post-acquisition period, financial performance objectives 3 years              
Acquisitions 2021                
Business Acquisition [Line Items]                
Fair value of total consideration transferred or estimated to be transferred         $ 61,705      
Number of shares granted for acquired companies (in shares)         32,822      
Value of quanta common stock issued         $ 2,479      
Contingent consideration     0   0   0  
Identified intangible assets         18,506      
Goodwill acquired         29,897      
Goodwill expected to be deductible for income tax     13,300   13,300   $ 13,300  
Revenues included in consolidated results of operations     13,400   14,600      
Income (loss) before taxes     (300)   (200)      
Acquisition costs     $ 2,000   2,400      
Cash consideration         $ 59,226      
Acquisitions 2020                
Business Acquisition [Line Items]                
Fair value of total consideration transferred or estimated to be transferred               $ 418,993
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               84,210
Goodwill expected to be deductible for income tax               72,600
Revenues included in consolidated results of operations       $ 55,200   $ 63,000    
Income (loss) before taxes       1,000   1,000    
Acquisition costs       $ 10,600   $ 11,400    
Cash consideration               $ 359,624
Blattner Holding Company | Subsequent Event                
Business Acquisition [Line Items]                
Cash consideration $ 2,290,000              
Number of shares granted for acquired companies (in shares) 3,300,000              
Value of quanta common stock issued $ 345,400              
Aggregate maximum payout amount $ 300,000              
Business Providing Electric Power Construction And Related Services | Subsequent Event                
Business Acquisition [Line Items]                
Number of shares granted for acquired companies (in shares)   42,748            
Value of quanta common stock issued   $ 4,000            
Cash consideration   $ 50,000