Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2018	Dec. 31, 2017 USD ($) Agreement Market shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares
Accounting Policies [Line Items]
Cash and cash equivalents	$ 39,560				$ 61,520					$ 39,560	$ 61,520
Restricted cash	222,294									222,294
Estimated losses for bad debts										1,100	800	$ 500
Bad debts actually charged off										1,100	1,400	600
Long term debt fair value	300,000				292,800					$ 300,000	292,800
Termination of swap agreements										Nov. 28, 2017
Interest expense										$ 16,709	15,469	13,047
Percentage of tax benefit recognized										50.00%
Advertising expense										$ 600	400	500
Net revenue	73,460	$ 334,555	$ 70,509	$ 57,510	70,291	$ 65,281	$ 64,829	$ 58,113		536,034	258,514	254,134
Broadcast trade cost										$ 900	$ 500	$ 500
Shares of dilutive securities not included in computation of diluted earnings per share | shares										243,234	698,344	299,143
Comprehensive income (loss)										$ 2,917	$ 1,138	$ (1,977)
Benefit in income tax expense related to excess tax benefits on 2017 vesting										$ (82,809)	$ (13,121)	$ (16,414)
Federal income tax rate										35.00%	35.00%	35.00%
Provisional one-time net tax benefit due to tax act										$ 17,300
Provisional decrease in value of the net deferred tax liabilities due to tax act										17,300
Net adjustment to deferred income tax benefit due to tax act										17,300
Scenario Plan
Accounting Policies [Line Items]
Federal income tax rate									21.00%
Broadcast Equipment
Accounting Policies [Line Items]
Net revenue										$ 900	$ 500	$ 500
Univision
Accounting Policies [Line Items]
Number of marketing and sales agreements | Agreement										2
Number of markets involved in sales and marketing | Market										6
Reclassification out of Accumulated Other Comprehensive Income
Accounting Policies [Line Items]
Interest expense										$ 2,500
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	$ 1,250									$ 1,250
Cost method investment ownership percentage	17.00%									17.00%
Cocina Vista, LLC
Accounting Policies [Line Items]
Cost method investments			$ 1,700
Cost method investment ownership percentage			34.35%
Investment milestone description										The Company is required to make a second investment of $1.5 million, for a total ownership interest of 51%, if Cocina achieves certain EBITDA goals through November 2018.
Second Investment | Cocina Vista, LLC
Accounting Policies [Line Items]
Cost method investments			$ 1,500
Cost method investment ownership percentage			51.00%
Accounting Standards Update 2016-18
Accounting Policies [Line Items]
Restricted cash	$ 222,300									$ 222,300
Restricted cash used temporary collateral for letters of credit	800									800
Accounting Standards Update 2016-18 | FCC
Accounting Policies [Line Items]
Proceeds for broadcast spectrum										221,500
Accounting Standards Update 2016-09
Accounting Policies [Line Items]
Cumulative-effect adjustment increase to deferred income taxes and total stockholders' equity	2,400									2,400
Benefit in income tax expense related to excess tax benefits on 2017 vesting										1,000
Outside the United States
Accounting Policies [Line Items]
Cash and cash equivalents	$ 5,800				$ 0					$ 5,800	$ 0