Related-Party Transactions - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Number of Class A common stock shares converted	1
Granted period television for terms of retransmission consent agreements	6 years
Retransmission consent agreements, expiration date	Dec. 31, 2014
Accounts receivable from third parties	$ 2.8	$ 2.3	$ 2.2
Fees paid for carriage of programming	$ 0
Univision [Member]
Related Party Transaction [Line Items]
Common stock percentage held by Univision	10.00%