Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill, net of accumulated amortization		$ 52,481
Changes due to foreign currency exchange rate fluctuations	$ 51	(167)
Less: accumulated impairment of goodwill		(51,306)
Goodwill [Roll Forward]
Goodwill	1,008
Acquired goodwill	5,158
Changes due to foreign currency exchange rate fluctuations	51	(167)
Goodwill	6,217	1,008
New York
Goodwill [Line Items]
Goodwill, net of accumulated amortization		31,549
Changes due to foreign currency exchange rate fluctuations	0	0
Less: accumulated impairment of goodwill		(31,549)
Goodwill [Roll Forward]
Goodwill	0
Acquired goodwill	5,158
Changes due to foreign currency exchange rate fluctuations	0	0
Goodwill	5,158	0
Boston
Goodwill [Line Items]
Goodwill, net of accumulated amortization		15,775
Changes due to foreign currency exchange rate fluctuations	0	0
Less: accumulated impairment of goodwill		(15,775)
Goodwill [Roll Forward]
Goodwill	0
Acquired goodwill	0
Changes due to foreign currency exchange rate fluctuations	0	0
Goodwill	0	0
Switzerland
Goodwill [Line Items]
Goodwill, net of accumulated amortization		1,175
Changes due to foreign currency exchange rate fluctuations	51	(167)
Less: accumulated impairment of goodwill		0
Goodwill [Roll Forward]
Goodwill	1,008
Acquired goodwill	0
Changes due to foreign currency exchange rate fluctuations	51	(167)
Goodwill	1,059	1,008
Outlier Clubs
Goodwill [Line Items]
Goodwill, net of accumulated amortization		3,982
Changes due to foreign currency exchange rate fluctuations	0	0
Less: accumulated impairment of goodwill		(3,982)
Goodwill [Roll Forward]
Goodwill	0
Acquired goodwill	0
Changes due to foreign currency exchange rate fluctuations	0	0
Goodwill	$ 0	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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