Organization, Nature of Operations, and Principles of Consolidation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2020 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
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201902Member
Minimum [Member]
Organization Nature Of Operations And Principles Of Consolidation [Line Items]
Percentage of digital streaming exclusively available for subscribers	85.00%
Percentage of produced and owned content views	80.00%