Basis of Presentation (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2017 club	Jun. 30, 2017 club segment	Dec. 31, 2016
Basis Of Presentation [Line Items]
Number of clubs	149	149
Number of reportable segments | segment		1
Joining fees, period of recognition (in months)		12 months
Annual fees, amortization period (in months)		12 months
Regular Member [Member]
Basis Of Presentation [Line Items]
Average member life (in months)	26 months	26 months	25 months
Partially Owned Properties [Member]
Basis Of Presentation [Line Items]
Number of clubs	1	1
New York Sports Clubs [Member]
Basis Of Presentation [Line Items]
Number of clubs	102	102
Boston Sports Clubs [Member]
Basis Of Presentation [Line Items]
Number of clubs	28	28
Washington Sports Clubs [Member]
Basis Of Presentation [Line Items]
Number of clubs	11	11
Partly Owned Clubs [Member]
Basis Of Presentation [Line Items]
Number of clubs	1	1
Philadelphia Sports Clubs [Member]
Basis Of Presentation [Line Items]
Number of clubs	5	5
Switzerland Clubs [Member]
Basis Of Presentation [Line Items]
Number of clubs	3	3