Annual report pursuant to Section 13 and 15(d)

Key Estimates and Assumptions Used in Start-Up Income Valuation of Broadcast Segment (Detail)

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Key Estimates and Assumptions Used in Start-Up Income Valuation of Broadcast Segment (Detail) (Broadcast licenses)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill And Other Intangible Assets [Line Items]    
Discount rate 9.00% 9.00%
Minimum
   
Goodwill And Other Intangible Assets [Line Items]    
Operating profit margin ranges 5.10% 3.80%
Long-term revenue growth rate ranges 0.30% 1.00%
Maximum
   
Goodwill And Other Intangible Assets [Line Items]    
Operating profit margin ranges 35.50% 38.00%
Long-term revenue growth rate ranges 15.00% 4.00%