Goodwill and Other Intangible Assets - Schedule of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Goodwill and Other Intangible Assets [Line Items]
Cost	$ 1,792,470	$ 1,792,470
Accumulated Amortization	(1,401,058)	(1,389,986)
Total	391,412	402,484
Trademarks and Trade Names [Member]
Goodwill and Other Intangible Assets [Line Items]
Trademarks and tradenames indefinite-lived	161,000	161,000
Cost	133,330	133,330
Accumulated Amortization	(51,781)	(46,810)
Total	81,549	86,520
Publishing Rights [Member]
Goodwill and Other Intangible Assets [Line Items]
Cost	1,050,000	1,050,000
Accumulated Amortization	(1,033,603)	(1,030,437)
Total	16,397	19,563
Customer Related and Other [Member]
Goodwill and Other Intangible Assets [Line Items]
Cost	448,140	448,140
Accumulated Amortization	(315,674)	(312,739)
Total	$ 132,466	$ 135,401