Annual report pursuant to Section 13 and 15(d)

Key Estimates and Assumptions Used for Enterprise Valuations (Detail)

v2.4.0.8
Key Estimates and Assumptions Used for Enterprise Valuations (Detail)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Internet and Publishing
          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Discount rate 9.00% 8.50% 9.50%   13.50%
Long-term revenue market growth rate ranges   1.50%     3.00%
Internet and Publishing | Minimum
          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Discount rate       8.50%  
Operating profit margin ranges 0.90% 1.40% (0.50%) 0.50% 18.40%
Long-term revenue market growth rate ranges 1.50%   1.50% 1.50%  
Internet and Publishing | Maximum
          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Discount rate       13.50%  
Operating profit margin ranges 6.00% 7.50% 6.00% 22.00% 22.00%
Long-term revenue market growth rate ranges 2.80%   6.10% 3.00%  
Goodwill-Broadcast
          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Discount rate     9.00% 9.00% 9.00%
Goodwill-Broadcast | Minimum
          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Long-term revenue market growth rate ranges     1.00% 0.30% 1.00%
Goodwill-Broadcast | Maximum
          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Operating profit margin ranges     37.50% 35.50% 38.00%
Long-term revenue market growth rate ranges     2.50% 15.00% 4.00%
Radio Clusters | Goodwill-Broadcast
          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Discount rate     9.00% 9.00% 9.00%
Radio Clusters | Goodwill-Broadcast | Minimum
          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Operating profit margin ranges     11.90% 16.90% 6.80%
Long-term revenue market growth rate ranges     1.00% 1.00% 1.50%
Radio Clusters | Goodwill-Broadcast | Maximum
          
Fair Value Inputs, Assets, Quantitative Information [Line Items]          
Operating profit margin ranges     44.70% 49.20% 45.40%
Long-term revenue market growth rate ranges     2.50% 3.50% 3.50%