Condensed consolidated statements of comprehensive income (loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income including non-controlling interests	$ 10,383	$ 31,639
Other comprehensive income (loss), net:
Foreign currency translation adjustments	(609)	54
Total other comprehensive income, net	(609)	54
Total comprehensive income including non-controlling interests	9,774	31,693
Less: total comprehensive income attributable to non-controlling interests	1,776	4,230
Total comprehensive income attributable to Planet Fitness, Inc.	$ 7,998	$ 27,463