Restructuring - Schedule of Components of Restructuring Expense by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Restructuring Cost And Reserve [Line Items]
Total restructuring expenses	$ 1,903	$ 309	$ 3,648	$ 6,229
United States [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expenses	448	212	2,191
International [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expenses	$ 1,455	$ 97	$ 1,457

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration