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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill   $ 1,484 $ 19,200  
Acquisitions 2017        
Business Acquisition [Line Items]        
Value of Quanta common stock issued $ 8,300 8,267    
Cash paid or payable 5,600 5,554    
Contingent consideration 0 0 0  
Fair value of total consideration transferred or estimated to be transferred   13,821    
Current assets 6,365 6,365 6,365  
Property and equipment 890 890 890  
Other assets 12 12 12  
Identifiable intangible assets 7,053 7,053 7,053  
Current liabilities (1,983) (1,983) (1,983)  
Deferred tax liabilities, net 0 0 0  
Other long-term liabilities 0 0 0  
Total identifiable net assets 12,337 12,337 12,337  
Goodwill   1,484    
Fair value of total consideration transferred or estimated to be transferred $ 13,821 $ 13,821 $ 13,821  
Acquisitions 2016        
Business Acquisition [Line Items]        
Value of Quanta common stock issued       $ 1,508
Cash paid or payable       75,941
Contingent consideration       18,683
Fair value of total consideration transferred or estimated to be transferred       96,132
Current assets       24,233
Property and equipment       44,863
Other assets       2,553
Identifiable intangible assets       11,467
Current liabilities       (12,097)
Deferred tax liabilities, net       (13,484)
Other long-term liabilities       (5,326)
Total identifiable net assets       52,209
Goodwill       43,923
Fair value of total consideration transferred or estimated to be transferred       $ 96,132