Consolidated statements of comprehensive income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income including non-controlling interests	$ 71,247	$ 38,130	$ 37,295
Other comprehensive (loss) income, net:
Loss on interest rate swaps, net of tax			(92)
Unrealized loss on interest rate caps, net of tax	(78)	(1,388)	(662)
Foreign currency translation adjustments	(72)	314	26
Total other comprehensive loss, net	(150)	(1,074)	(728)
Total comprehensive income including non-controlling interests	71,097	37,056	36,567
Less: total comprehensive income attributable to non-controlling interests	49,560	19,557	487
Total comprehensive income attributable to Planet Fitness, Inc.	$ 21,537	$ 17,499	$ 36,080