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Equity - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
Mar. 26, 2013
Aug. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity [Line Items]          
Minimum number of shares that can be exchanged by exchangeable shareholders unless the number of remaining exchangeable shares registered in the name of the holder is less     50,000    
Number of shares of Common stock received for each exchangeable share     1    
Exchangeable shares exchanged for common stock 409,110        
Common stock, shares outstanding     212,942,767 209,270,586  
Value of treasury stock acquired, cost method   $ 149,500,000     $ 149,547,000
Aggregate authorized amount of common stock to be repurchased   150,000,000 500,000,000    
Stock repurchased during the period     0    
Reduction in net income as a result of non controlling interests     19,388,000 16,027,000 11,901,000
Carrying value of the investments held by Quanta in variable interest entities     7,100,000 5,400,000  
Distributions to noncontrolling interests     17,625,000 17,970,000 5,954,000
Carrying value of the investment held by noncontrolling interest in variable interest entities     7,131,000 5,368,000  
Series F Preferred Stock [Member]
          
Equity [Line Items]          
Number of preferred Stock issued to voting trust     1    
Limited Vote Common Stock [Member]
          
Equity [Line Items]          
Number of Limited Vote Common Stock exchanged for common stock         (432,485)
Common stock, shares outstanding     0 0  
Number of common stock shares received for each share of Common Stock converted         1.05
Fraction of vote Common Stockholders were allowed on all matters other than election of the Board     0.1    
Common Stock [Member]
          
Equity [Line Items]          
Exchangeable shares exchanged for common stock     409,110    
Number of Limited Vote Common Stock exchanged for common stock         454,107
Treasury stock acquired   8,100,000     8,133,329
Common Stock Withheld for Settlement of Employee Tax Liabilities [Member]
          
Equity [Line Items]          
Treasury stock acquired     379,566 370,007 299,804
Value of treasury stock acquired, cost method     $ 12,100,000 $ 6,700,000 $ 6,600,000