Basis of Presentation (Details)	12 Months Ended
	Dec. 31, 2017 club segment	Sep. 30, 2017 club
Basis Of Presentation [Line Items]
Number of clubs	165
Number of reportable segments | segment	1
New York
Basis Of Presentation [Line Items]
Number of clubs	119
New York | New York Sports Clubs
Basis Of Presentation [Line Items]
Number of clubs	102
New York | Lucille Roberts Health Clubs
Basis Of Presentation [Line Items]
Number of clubs	16	16
New York | TMPL Sports Clubs
Basis Of Presentation [Line Items]
Number of clubs	1
Manhattan
Basis Of Presentation [Line Items]
Number of clubs	39
Boston
Basis Of Presentation [Line Items]
Number of clubs	28
Washington
Basis Of Presentation [Line Items]
Number of clubs	10
Washington | Partly Owned Clubs, Washington Sports Clubs
Basis Of Presentation [Line Items]
Number of clubs	1
Washington | Partly Owned Clubs, Different Brand Name
Basis Of Presentation [Line Items]
Number of clubs	1
Philadelphia
Basis Of Presentation [Line Items]
Number of clubs	5
Switzerland
Basis Of Presentation [Line Items]
Number of clubs	3