Percentage Range by Which Fair Value Exceeds Carrying Value of Broadcasting Licenses for Each of Clusters (Detail) (Broadcast licenses, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Entity
Less than or equal to 25%
Fair Value Measurements [Line Items]
Number of market clusters	9
Carrying value	$ 217,111
>26% to 30%
Fair Value Measurements [Line Items]
Number of market clusters	1
Carrying value	18,501
>30% to 75%
Fair Value Measurements [Line Items]
Number of market clusters	2
Carrying value	13,577
Less than or equal 5% | Station Operating Income [Member]
Fair Value Measurements [Line Items]
Number of market clusters	8
Carrying value	51,850
>6% To 10% | Station Operating Income [Member]
Fair Value Measurements [Line Items]
Number of market clusters	1
Carrying value	2,402
>11% To 40 % | Station Operating Income [Member]
Fair Value Measurements [Line Items]
Number of market clusters	4
Carrying value	61,354
> than 40% | Station Operating Income [Member]
Fair Value Measurements [Line Items]
Number of market clusters	8
Carrying value	$ 21,835