Segments - Schedule of Financial Information for the Company's Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Total revenue	$ 292,246	$ 277,551	$ 841,204	$ 786,240
Total Segment EBITDA	120,944	109,734	352,616	311,813
Corporate and other
Segment Reporting Information [Line Items]
Total Segment EBITDA	(20,408)	(18,547)	(57,191)	(52,238)
Franchise segment
Segment Reporting Information [Line Items]
Total revenue	102,415	98,165	314,225	289,691
Franchise segment | Operating segments
Segment Reporting Information [Line Items]
Total Segment EBITDA	72,758	67,583	226,478	198,418
Corporate-owned clubs
Segment Reporting Information [Line Items]
Total revenue	128,132	113,245	375,976	332,885
Corporate-owned clubs | Operating segments
Segment Reporting Information [Line Items]
Total Segment EBITDA	50,107	44,264	141,507	126,499
Equipment segment
Segment Reporting Information [Line Items]
Total revenue	61,699	66,141	151,003	163,664
Equipment segment | Operating segments
Segment Reporting Information [Line Items]
Total Segment EBITDA	18,487	16,434	41,822	39,134
US | Franchise segment
Segment Reporting Information [Line Items]
Total revenue	98,902	95,209	303,971	281,836
US | Corporate-owned clubs
Segment Reporting Information [Line Items]
Total revenue	126,716	112,080	372,061	329,505
US | Equipment segment
Segment Reporting Information [Line Items]
Total revenue	58,081	62,605	140,824	158,335
International | Franchise segment
Segment Reporting Information [Line Items]
Total revenue	3,513	2,956	10,254	7,855
International | Corporate-owned clubs
Segment Reporting Information [Line Items]
Total revenue	1,416	1,165	3,915	3,380
International | Equipment segment
Segment Reporting Information [Line Items]
Total revenue	$ 3,618	$ 3,536	$ 10,179	$ 5,329