Quarterly report pursuant to Section 13 or 15(d)

CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS (Details)

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CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Related Party Transaction [Line Items]          
Aggregate cash consideration of common shares sold     $ 76,492,000    
Clear Channel [Member]
         
Related Party Transaction [Line Items]          
Expenses from transactions with related party 1,000,000 1,000,000 1,400,000 1,700,000  
Liberty Media [Member]
         
Related Party Transaction [Line Items]          
Number of directors nominated by related party 2   2    
Common shares sold to related party pursuant to the subscription agreement (in shares)     1,800,000    
Aggregate cash consideration of common shares sold     18,800,000    
Additional common shares sold to related party pursuant to the subscription agreement (in shares) 5,500,000   5,500,000    
Additional aggregate cash consideration of common shares sold 57,700,000   57,700,000    
IAC [Member]
         
Related Party Transaction [Line Items]          
Expenses from transactions with related party 400,000 600,000 800,000 1,000,000  
ATC Aviation, Inc. [Member]
         
Related Party Transaction [Line Items]          
Expenses from transactions with related party 500,000 100,000 600,000 100,000  
Front Line [Member]
         
Related Party Transaction [Line Items]          
Dividends paid by consolidated subsidiary     20,100,000 20,600,000  
Dividends paid by consolidated subsidiary to parent     15,000,000 15,000,000  
Principal amount of promissory note made by a wholly owned subsidiary to a majority owned subsidiary     20,700,000 21,300,000  
Interest rate of promissory note (in hundredths) 4.50% 4.50% 4.50% 4.50%  
Azoff Trust [Member]
         
Related Party Transaction [Line Items]          
Dividends paid by majority owned consolidated subsidiary to minority owners     3,000,000 3,000,000  
Common shares held by noncontrolling interest shareholder (in shares)   25,918.276   25,918.276  
Board of Directors Chairman [Member]
         
Related Party Transaction [Line Items]          
Gross-up payment related party     600,000 700,000  
Management of Subsidiary [Member]
         
Related Party Transaction [Line Items]          
Deferred consideration payments from a business combination     6,800,000 6,900,000  
Employee of Subsidiary [Member]
         
Related Party Transaction [Line Items]          
Noncontrolling interest in clubs and theaters venue promotion business sold (in hundredths) 49.90%   49.90%    
Number of employees that partially own business 2   2    
Cash and assets received from divestiture of noncontrolling interest in a business     12,600,000    
Other Related Parties [Member]
         
Related Party Transaction [Line Items]          
Revenue from transactions with related party 243,000 58,000 809,000 421,000  
Expenses from transactions with related party 1,941,000 2,098,000 5,519,000 8,555,000  
Receivable balance $ 12,900,000   $ 12,900,000   $ 22,400,000