Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-47

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 54
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-54

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-18

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Business organization (Details) member in Millions	6 Months Ended
Business organization (Details) member in Millions	Jun. 30, 2026 segment member store state	Mar. 31, 2026 store	Dec. 31, 2025 store	Jun. 30, 2025 store	Mar. 31, 2025 store	Dec. 31, 2024 store
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of members \| member	21.5
Clubs operated at beginning of period \| store	2,930	2,909	2,896	2,762	2,741	2,722
Number of states in which entity operates \| state	50
Number of reportable segments \| segment	3