Goodwill and other intangible assets - Goodwill, Indefinite-Lived Intangible Assets, and Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (298,593)	$ (235,582)
Amortizable intangible assets, net	317,590
Intangible assets, gross	2,740,081	2,739,226
Intangible assets, net	2,441,488	2,503,644
Licensing Agreements
Indefinite-lived Intangible Assets [Line Items]
Television and radio station FCC broadcast licenses	2,123,898	2,123,898
Retransmission agreements
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	235,215	235,215
Accumulated Amortization	(168,439)	(138,928)
Amortizable intangible assets, net	66,776	96,287
Network affiliation agreements
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	309,503	309,503
Accumulated Amortization	(97,195)	(72,694)
Amortizable intangible assets, net	212,308	236,809
Other
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	71,465	70,610
Accumulated Amortization	(32,959)	(23,960)
Amortizable intangible assets, net	$ 38,506	$ 46,650