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Redeemable Noncontrolling Interests and Noncontrolling Interest (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Noncontrolling Interest [Line Items]      
Ownership interest held by noncontrolling interest (in hundredths)     31.00%
Redeemable noncontrolling interest $ 115,722 $ 162,750  
Travel Channel [Member]
     
Noncontrolling Interest [Line Items]      
Ownership interest held by noncontrolling interest (in hundredths) 35.00%    
Redeemable noncontrolling interest $ 116,000 $ 163,000  
Food Network Partnership [Member]
     
Noncontrolling Interest [Line Items]      
Ownership interest held by noncontrolling interest (in hundredths) 31.00%