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 $)
Share data in Millions, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2011
Liberty Media [Member]
Feb. 28, 2011
Liberty Media [Member]
Sep. 30, 2012
Liberty Media [Member]
Sep. 30, 2012
ATC Aviation, Inc. [Member]
Sep. 30, 2011
ATC Aviation, Inc. [Member]
Sep. 30, 2012
ATC Aviation, Inc. [Member]
Sep. 30, 2011
ATC Aviation, Inc. [Member]
Jan. 31, 2011
Front Line [Member]
Jan. 31, 2011
Azoff Trust [Member]
Jan. 31, 2011
Employee of Subsidiary [Member]
Sep. 30, 2012
Other Related Parties [Member]
Sep. 30, 2011
Other Related Parties [Member]
Sep. 30, 2012
Other Related Parties [Member]
Sep. 30, 2011
Other Related Parties [Member]
Dec. 31, 2011
Other Related Parties [Member]
Sep. 30, 2012
Director Related Parties [Member]
Sep. 30, 2011
Director Related Parties [Member]
Sep. 30, 2012
Director Related Parties [Member]
Sep. 30, 2011
Director Related Parties [Member]
Jan. 31, 2011
Board of Directors Chairman [Member]
Sep. 30, 2011
Management of Subsidiary [Member]
Sep. 30, 2012
Sublease [Member]
Sep. 30, 2011
Sublease [Member]
Sep. 30, 2012
Sublease [Member]
Sep. 30, 2011
Sublease [Member]
Related Party Transaction [Line Items]                                                  
Number of directors nominated by related party     2                                            
Common shares sold to related party pursuant to the subscription agreement (in shares) 5.5 1.8                                              
Aggregate cash consideration of common shares sold $ 57,700,000 $ 18,800,000                                              
Revenue from transactions with related parties                     1,651,000 1,256,000 3,604,000 3,196,000   3,188,000 7,066,000 11,509,000 7,066,000            
Expenses from transactions with related party       100,000 600,000 1,200,000 1,200,000       10,123,000 1,837,000 13,980,000 7,667,000   4,021,000 6,940,000 13,174,000 8,369,000     (200,000) (200,000) (600,000) (600,000)
Dividend paid by consolidated subsidiary               20,100,000 3,000,000                                
Dividend paid by consolidated subsidiary to parent               15,000,000                                  
Gross-up payment received by a related party                                       600,000          
Principal amount of promissory note made by a wholly owned subsidiary to a majority owned subsidiary               20,700,000                                  
Interest rate of promissory note (in hundredths)               4.50%                                  
Deferred consideration paid in connection with business combination                                         6,800,000        
Noncontrolling interest in clubs and theaters venue promotion business sold (in hundredths)                   49.90%                              
Number of employees that partially own business                   2                              
Cash and assets received from divestiture of noncontrolling interest in a business                   12,600,000                              
Receivable balance                     $ 12,300,000   $ 12,300,000   $ 13,300,000