Summary of Significant Accounting Policies - Advertising, Cash, and Deferred Lease (Details) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Advertising expense		$ 11,057,000	$ 7,903,000	$ 5,943,000
Captive insurance required balance		250,000
Cash related to captive insurance that was included in cash and cash equivalents		275,000	274,000
Amortization of lease incentives		2,920,000	2,771,000	3,310,000
Proceeds from termination of lease by landlord	$ 3,090,000
Gain (Loss) on Contract Termination		2,967,000	0	$ 0
Net occupancy gain on club closure			1,442,000
Operating Expense [Member]
Financing Receivable, Impaired [Line Items]
Lease termination penalty		$ 1,550,000	$ 1,482,000