Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income and Expenses [Abstract]
Membership dues									$ 296,795	$ 309,096	$ 343,185
Initiation and processing fees									7,636	13,644	12,044
Personal training revenue									66,487	73,191	70,338
Other ancillary club revenue									19,642	22,138	22,304
Total club revenue									390,560	418,069	447,871
Fees and other revenue									6,361	6,254	5,971
Total revenue	$ 96,107	$ 98,534	$ 100,935	$ 101,345	$ 100,839	$ 103,764	$ 108,296	$ 111,424	$ 396,921	$ 424,323	$ 453,842