Condensed consolidated statements of comprehensive income (loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income including non-controlling interests	$ 31,639	$ 23,493
Other comprehensive income (loss), net:
Unrealized gain on interest rate caps, net of tax	0	366
Foreign currency translation adjustments	54	(29)
Total other comprehensive income, net	54	337
Total comprehensive income including non-controlling interests	31,693	23,830
Less: total comprehensive income attributable to non-controlling interests	4,230	3,671
Total comprehensive income attributable to Planet Fitness, Inc.	$ 27,463	$ 20,159