Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Mar. 16, 2020	Jun. 30, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	TOWN SPORTS INTERNATIONAL HOLDINGS INC
Entity Central Index Key	0001281774
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-K/A
Amendment Description	This Amendment No. 1 on Form 10-K/A (this “Form 10-K/A”) to the Annual Report on Form 10-K of Town Sports International, Inc. (the “Company,” “TSI,” “we,” “us” or “our”) for the year ended December 31, 2019, filed with the Securities and Exchange Commission on March 20, 2020 (the “Original 10-K”), is being filed for the purposes of (i) including the information required by Part III, Items 10-14, of Form 10-K. At the time the Company filed the Original 10-K, it intended to file a definitive proxy statement for its 2019 Annual Meeting of Stockholders within 120 days after the end of its fiscal year pursuant to Regulation 14A promulgated under the Securities Exchange Act of 1934, as amended. Because the Company will not file the definitive proxy statement within such 120-day period, the omitted information in Part III, Items 10-14, is filed herewith and provided below as required.
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	true
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		29,710,045
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 32.7