Condensed Consolidated Statement of Changes in Equity (Deficit) - 6 months ended Jun. 30, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Accumulated Other Comprehensive Loss [Member]	Additional Paid-in capital [Member]	Accumulated Deficit [Member]	Non-Controlling Interests [Member]	Class A Common Stock [Member]	Class A Common Stock [Member] Common Stock [Member]	Class B Common Stock [Member]	Class B Common Stock [Member] Common Stock [Member]
Beginning balance at Dec. 31, 2015	$ (1,080)	$ (1,710)	$ 352	$ (14,032)	$ 14,300		$ 4		$ 6
Beginning balance (shares) at Dec. 31, 2015						36,598		62,112
Net income	34,437			7,501	26,936
Equity-based compensation expense	960		960
Repurchase and retirement of Class B common stock	(1,583)		(441)	(1,142)
Repurchase and retirement of Class B common stock, shares								(141)
Exchange of Class B common stock		857	3,023		(3,880)
Exchange of Class B common stock, shares						7,891		(7,891)
Tax benefit arrangement liability and deferred taxes arising from the secondary offering	4,087		4,087
Distributions paid to members of Pla-Fit Holdings	(17,472)				(17,472)
Other comprehensive loss	(758)	(214)			(544)
Ending balance at Jun. 30, 2016	$ 18,591	$ (1,067)	$ 7,981	$ (7,673)	$ 19,340		$ 4		$ 6
Ending balance (shares) at Jun. 30, 2016						44,489		54,080