Condensed consolidated statements of comprehensive income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income including non-controlling interests	$ 14,863	$ 738	$ 49,300	$ 20,890
Other comprehensive income (loss), net:
Unrealized gain (loss) on interest rate caps, net of tax	193	(557)	(469)	(1,497)
Foreign currency translation adjustments	11	198	(84)	245
Total other comprehensive income (loss), net	204	(359)	(553)	(1,252)
Total comprehensive income including non-controlling interests	15,067	379	48,747	19,638
Less: total comprehensive income attributable to non-controlling interests	11,572	4,423	37,964	4,649
Total comprehensive income (loss) attributable to Planet Fitness, Inc.	$ 3,495	$ (4,044)	$ 10,783	$ 14,989