Equity-Based Compensation Expense - Schedule of Nonvested Restricted Stock Units Activity (Parenthetical) (Detail) $ in Thousands	Sep. 30, 2021 USD ($)
Restricted Incentive Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award equity instruments other than options unrecognized compensation	$ 8,735

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant