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Acquisitions - Aggregate Consideration Paid or Payable and Allocation of Net Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill $ 1,780 $ 75,800 $ 86,197
Acquisitions 2021      
Business Acquisition [Line Items]      
Cash paid or payable 3,500    
Value of Quanta common stock issued 0    
Contingent consideration 0 0  
Fair value of total consideration transferred or estimated to be transferred 3,500    
Accounts receivable 0 0  
Contract assets 0 0  
Other current assets 0 0  
Property and equipment 1,327 1,327  
Other assets 0 0  
Identifiable intangible assets 393 393  
Contract liabilities 0 0  
Other current liabilities 0 0  
Deferred tax liabilities, net 0 0  
Total identifiable net assets 1,720 1,720  
Goodwill 1,780    
Fair value of net assets acquired $ 3,500 $ 3,500  
Acquisitions 2020      
Business Acquisition [Line Items]      
Cash paid or payable     349,310
Value of Quanta common stock issued     57,119
Contingent consideration     2,250
Fair value of total consideration transferred or estimated to be transferred     408,679
Accounts receivable     74,492
Contract assets     8,919
Other current assets     51,807
Property and equipment     133,511
Other assets     14
Identifiable intangible assets     96,827
Contract liabilities     (3,750)
Other current liabilities     (34,890)
Deferred tax liabilities, net     (3,185)
Total identifiable net assets     323,745
Goodwill     84,934
Fair value of net assets acquired     $ 408,679