Income Taxes - Schedule of Effective Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Computed “expected” tax provision (benefit)	$ (2,400)	$ 4,500	$ 90,300
Change in income tax resulting from:
State taxes, net of federal benefit	1,000	1,500	8,500
Change in fair value of earnout	(1,600)	400
Non-deductible executive compensation	300	300	700
State tax impact of previously deferred gain from FCC auction for broadcast spectrum	1,800
Change in federal tax rate			(17,300)
Change in state tax rate	400	500
Stock compensation	400	500	(1,000)
Change in unrecognized tax benefits	700	(300)
Impairment	6,400
Other	1,200	500	1,400
Total provision (benefit) for taxes	$ 8,158	$ 7,877	$ 82,612