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Fair Value Measurements (Details 2) (Discounted cash flow, USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Jan. 31, 2011
Minimum
Dec. 31, 2010
Minimum
Jan. 31, 2011
Maximum
Dec. 31, 2010
Maximum
Dec. 31, 2012
Guitar Center
Specific-store leasehold improvements
Level 3 inputs
Dec. 31, 2011
Guitar Center
Specific-store leasehold improvements
Level 3 inputs
Dec. 31, 2011
Direct Response
Minimum
Dec. 31, 2011
Direct Response
Maximum
Dec. 31, 2011
Direct Response
Customer relationships
Level 3 inputs
Dec. 31, 2011
Direct Response
Customer relationships
Level 3 inputs
Minimum
Dec. 31, 2011
Direct Response
Customer relationships
Level 3 inputs
Maximum
Dec. 31, 2011
Direct Response
Trademarks/trade names
Level 3 inputs
Dec. 31, 2011
Direct Response
Trademarks/trade names
Level 3 inputs
Minimum
Dec. 31, 2011
Direct Response
Trademarks/trade names
Level 3 inputs
Maximum
Fair value measurements                            
Fair value of Specific-store leasehold improvements         $ 195 $ 745     $ 6,800     $ 11,500    
Weighted-average cost of capital (as a percent) 12.50% 11.00% 14.00% 14.00% 9.80% 10.90% 14.00% 15.00% 17.50%     16.50%    
Long-term revenue growth rate (as a percent)         3.00% 3.00%           1.00%    
Customer attrition rate (as a percent)                   25.00% 59.90%      
Royalty rates (as a percent)                         0.50% 1.50%