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Acquisitions - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2023
USD ($)
business
shares
Jul. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Business Acquisition [Line Items]            
Net tangible assets acquired           $ 184,800,000
Intangible assets           120,500,000
Goodwill           306,600,000
Cash payment for contingent consideration liabilities       $ 5,000,000 $ 1,600,000  
Acquisitions 2023            
Business Acquisition [Line Items]            
Number of businesses acquired | business 3          
Cash consideration $ 463,500,000          
Number of shares granted for acquired companies (in shares) | shares 1,018,946          
Value of Quanta common stock issued $ 123,500,000     123,503,000    
Cash consideration       463,482,000    
Intangible assets       107,430,000    
Goodwill       293,988,000    
Goodwill expected to be deductible for income tax     $ 238,200,000 238,200,000   238,200,000
Revenues included in consolidated results of operations       236,600,000    
Income (loss) before taxes       (3,200,000)    
Amortization expense     6,400,000 15,000,000    
Acquisition costs       17,800,000    
Acquisitions 2022            
Business Acquisition [Line Items]            
Cash consideration   $ 22,300,000        
Post-acquisition period, financial performance objectives (in years)   5 years        
Acquisitions, Multiple Periods            
Business Acquisition [Line Items]            
Contingent consideration payments (up to)     321,800,000 $ 321,800,000   $ 321,800,000
Construction Contracting Services Business Acquisition            
Business Acquisition [Line Items]            
Revenues included in consolidated results of operations     143,100,000      
Income (loss) before taxes     12,900,000      
Acquisition costs     $ 0