Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment Estimated Useful Lives (Detail)

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Property, Plant and Equipment Estimated Useful Lives (Detail)
 12 Months Ended
Dec. 31, 2012
Buildings
  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 40 years
Office Furnishings And Equipment | Minimum
  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 5 years
Office Furnishings And Equipment | Maximum
  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 10 years
Antennae, towers and transmitting equipment
  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 20 years
Studio and Production Equipment | Minimum
  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 7 years
Studio and Production Equipment | Maximum
  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 10 years
Computer Software and Website Development Costs
  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 3 years
Record and Tape Libraries
  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 3 years
Automobiles
  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, useful life 5 years
Leasehold improvements
  
Property Plant and Equipment Estimated Useful Lives [Line Items]  
Property plant and equipment, estimated useful life, description Lesser of 15 years or life of lease