Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated losses for bad debts		$ 1,000,000	$ 900,000
Bad debts actually charged off	1,100,000	700,000	2,600,000
Long term debt fair value	364,100,000	371,300,000
Percentage of tax benefit recognized	50.00%
Advertising expense	300,000	300,000	400,000
Period to grant television station for terms of retransmission consent agreements	6 years
Retransmission consent agreements, expiring date	Dec. 31, 2014
Retransmission consent revenue	22,200,000	20,200,000	17,100,000
Broadcast trade revenue	500,000	600,000	800,000
Broadcast trade cost	500,000	600,000	800,000
Shares of dilutive securities not included in computation of diluted income per share	5,670,908	8,573,761	610,650
Comprehensive income	$ 234,000	$ 0	$ 0
Interest Rate Swap Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Term loan beginning date	Dec. 31, 2015