Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Current deferred revenue recognized	$ 96.4		$ 726.7
Minimum [Member]
Disaggregation Of Revenue [Line Items]
Contract payment term related to advertising arrangements			30 days
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Contract payment term related to advertising arrangements			60 days
Durable Virtual Items
Disaggregation Of Revenue [Line Items]
Estimated weighted average life of product	10 months	9 months	10 months	10 months