Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Line Items]
Purchases of short-term investments									$ 30,000
Estimated losses for bad debts									800	$ 500	$ 400
Bad debts actually charged off									1,400	600	900
Long term debt fair value	$ 292,800				$ 316,600				$ 292,800	316,600
Percentage of tax benefit recognized									50.00%
Advertising expense									$ 400	500	500
Retransmission consent revenue									29,600	27,900	26,400
Net revenue	70,291	$ 65,281	$ 64,829	$ 58,113	65,432	$ 69,261	$ 59,891	$ 59,550	258,514	254,134	242,038
Broadcast trade cost									$ 500	$ 500	$ 500
Shares of dilutive securities not included in computation of diluted earnings per share									698,344	299,143	1,116,750
Comprehensive income (loss)									$ 1,138	$ (1,977)	$ (2,372)
Unamortized debt issuance costs	2,365				$ 3,226				2,365	3,226
Broadcast Equipment
Accounting Policies [Line Items]
Net revenue									$ 500	$ 500	$ 500
Univision
Accounting Policies [Line Items]
Period to grant television station for terms of retransmission consent agreements									6 years
Retransmission consent agreements expired date									Dec. 31, 2014
Retransmission consent agreements extended expiration date									Mar. 31, 2017
Interest Rate Swap Agreements
Accounting Policies [Line Items]
Interest rate swap effective date									Dec. 31, 2015
Chanclazo Studios, Inc
Accounting Policies [Line Items]
Cost method investments	$ 500								$ 500
Cost method investment ownership percentage	6.00%								6.00%
Certificate of Deposit
Accounting Policies [Line Items]
Purchases of short-term investments				$ 30,000