The Company and Significant Accounting Policies - Carrying Amount of Intangible Assets Not Subject to Amortization (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets, Beginning balance	$ 252,544
Impairment	(32,257)
Assets Sold	(3,434)
Intangible assets, Ending balance	216,853
Television
Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets, Beginning balance	157,165
Impairment	(23,457)
Assets Sold	(3,434)
Intangible assets, Ending balance	130,274
Radio
Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets, Beginning balance	95,379
Impairment	(8,800)
Intangible assets, Ending balance	$ 86,579