XML 55 R41.htm IDEA: XBRL DOCUMENT v2.4.0.6
Equity (Narrative) (Detail) (USD $)
 3 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Aug. 31, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Class of Stock [Line Items]            
Number of preferred Stock issued to voting trust       1    
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    
Treasury stock acquired       289,057 279,565  
Value of treasury stock acquired, cost method       $ 6,200,000 $ 6,200,000  
Aggregate authorized amount of common stock to be repurchased     150,000,000      
Reduction in net income as a result of non controlling interests 4,458,000 3,606,000   13,004,000 7,407,000  
Carrying value of the investments held by Quanta in variable interest entities 7,345,000     7,345,000   7,311,000
Carrying value of the investment held by noncontrolling interest in variable interest entities 7,345,000     7,345,000   7,311,000
Distributions to noncontrolling interests 6,733,000 0   12,970,000 471,000  
Series F Preferred Stock [Member]
            
Class of Stock [Line Items]            
Number of preferred Stock issued to voting trust 1     1    
Common Stock [Member]
            
Class of Stock [Line Items]            
Treasury stock acquired     8,100,000      
Treasury Stock [Member]
            
Class of Stock [Line Items]            
Value of treasury stock acquired, cost method     $ 149,500,000