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Equity - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended
Mar. 26, 2013
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
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      
Aggregate authorized amount of common stock to be repurchased   $ 500,000,000    
Reduction in net income as a result of non controlling interests   4,240,000 4,776,000  
Carrying value of the investments held by Quanta in variable interest entities   10,900,000   7,100,000
Distributions to noncontrolling interests   500,000 5,500,000  
Carrying value of the investment held by noncontrolling interest in variable interest entities   10,871,000   7,131,000
Series F Preferred Stock [Member]
        
Equity [Line Items]        
Number of preferred Stock issued to voting trust   1    
Common Stock Withheld for Settlement of Employee Tax Liabilities [Member]
        
Equity [Line Items]        
Treasury stock acquired   324,959 296,874  
Value of treasury stock acquired, cost method   11,400,000 9,700,000  
Stock repurchased during the period   $ 0