Organization, Nature of Operations, and Principles of Consolidation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2021 Title Channel
Organization Nature Of Operations And Principles Of Consolidation [Line Items]
Number of titles available in digital content library | Title	8,000
Number of channels | Channel	4
ASU 2019-12 [Member]
Organization Nature Of Operations And Principles Of Consolidation [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2021
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
Minimum [Member]
Organization Nature Of Operations And Principles Of Consolidation [Line Items]
Percentage of digital streaming exclusively available for subscribers	80.00%
Percentage of produced and owned content views	80.00%