Condensed consolidated statements of comprehensive income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income including non-controlling interests	$ 18,091	$ 11,614	$ 34,437	$ 20,152
Other comprehensive income (loss), net:
Unrealized loss on interest rate caps, net of tax	(79)	(161)	(662)	(940)
Foreign currency translation adjustments	(3)	(54)	(96)	47
Total other comprehensive loss, net	(82)	(215)	(758)	(893)
Total comprehensive income including non-controlling interests	18,009	11,399	33,679	19,259
Less: total comprehensive income attributable to non-controlling interests	13,899	113	26,392	226
Total comprehensive income attributable to Planet Fitness, Inc.	$ 4,110	$ 11,286	$ 7,287	$ 19,033