Annual report pursuant to Section 13 and 15(d)

Key Estimates and Assumptions used in Start-Up Income Valuation of Broadcast Units For Each Testing Period (Detail)

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Key Estimates and Assumptions used in Start-Up Income Valuation of Broadcast Units For Each Testing Period (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Broadcast licenses
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Discount rate 9.00% 9.00% 9.00%
Broadcast licenses | Minimum
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Operating profit margin ranges 4.10% 5.10% 3.80%
Long-term market revenue growth rate ranges 1.00% 0.30% 1.00%
Broadcast licenses | Maximum
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Operating profit margin ranges 37.50% 35.50% 36.30%
Long-term market revenue growth rate ranges 2.50% 15.00% 4.00%
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]      
Operating profit margin ranges 4.10% 5.10% 3.80%
Long-term market revenue 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 market revenue growth rate ranges 2.50% 15.00% 4.00%