Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Narrative) (Details)

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Stockholders' Equity (Narrative) (Details)
 0 Months Ended
Apr. 11, 2014
Sep. 30, 2014
Dec. 31, 2013
Common Class C | Interactive Group
      
Class of Stock [Line Items]      
Common stock, shares authorized   4,000,000,000  
Common Stock, Shares, Issued   0  
Common Class C | Ventures Group
      
Class of Stock [Line Items]      
Common stock, shares authorized   200,000,000  
Common Stock, Shares, Outstanding   0  
Common Class A | Interactive Group
      
Class of Stock [Line Items]      
Number of shares reserved for issuance   28,900,000  
Common stock, shares authorized   4,000,000,000 4,000,000,000
Common Stock, Shares, Issued   447,055,195 471,625,030
Common Stock, Shares, Outstanding   447,055,195 471,625,030
Common Class A | Ventures Group
      
Class of Stock [Line Items]      
Number of shares reserved for issuance   1,800,000  
Common stock, shares authorized   200,000,000 200,000,000
Common Stock, Shares, Issued   70,799,197 70,761,208
Common Stock, Shares, Outstanding   70,799,197 70,761,208
Stock split, conversion ratio 2    
Stock split, dividends 1    
Common Class B | Interactive Group
      
Class of Stock [Line Items]      
Number of shares reserved for issuance   432,000  
Common stock, shares authorized   150,000,000 150,000,000
Common Stock, Shares, Issued   28,879,268 28,884,103
Common Stock, Shares, Outstanding   28,879,268 28,884,103
Common Class B | Ventures Group
      
Class of Stock [Line Items]      
Number of shares reserved for issuance   44,000  
Common stock, shares authorized   7,500,000 7,500,000
Common Stock, Shares, Issued   2,885,370 2,885,378
Common Stock, Shares, Outstanding   2,885,370 2,885,378
Stock split, conversion ratio 2    
Stock split, dividends 1