Annual report pursuant to Section 13 and 15(d)

Percentage Within Range by Which Fair Value Exceeded Carrying Value of Each Clusters Including Goodwill (Detail)

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Percentage Within Range by Which Fair Value Exceeded Carrying Value of Each Clusters Including Goodwill (Detail) (Goodwill-Broadcast, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Entity
Dec. 31, 2012
Entity
Dec. 31, 2011
Entity
Less than or equal 5%
      
Carrying Amounts and Fair Values of Financial Instruments [Line Items]      
Number of market clusters 4 2 1
Carrying value $ 28,952 $ 18,836 $ 9,877
>6% To 10%
      
Carrying Amounts and Fair Values of Financial Instruments [Line Items]      
Number of market clusters 1 1 2
Carrying value 17,978 1,423 17,487
>11% To 40 %
      
Carrying Amounts and Fair Values of Financial Instruments [Line Items]      
Number of market clusters 3 1 3
Carrying value 45,375 10,506 68,506
> than 40%
      
Carrying Amounts and Fair Values of Financial Instruments [Line Items]      
Number of market clusters 3 5 2
Carrying value $ 45,152 $ 132,645 $ 5,178