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Acquisition - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition [Line Items]          
Value of Quanta common stock issued $ 37,291 $ 32,400 $ 88,895 $ 37,291 $ 32,400
Cash paid     341,100    
Goodwill     255,806 64,779  
All Acquisitions [Member]
          
Business Acquisition [Line Items]          
Value of Quanta common stock issued     88,895 37,291  
Cash paid     341,064 68,507  
Fair value of total consideration transferred     429,959 105,798  
Current assets     193,895 20,516  
Property and equipment     60,988 18,821  
Other assets     1,009 123  
Identifiable intangible assets     55,124 17,931  
Current liabilities     (127,430) (10,008)  
Deferred tax liabilities, net     (4,083) (6,173)  
Other long-term liabilities     (5,350) (191)  
Total identifiable net assets     174,153 41,019  
Goodwill     255,806 64,779  
Fair value of total consideration transferred     $ 429,959 $ 105,798