Consolidated statements of operations - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Franchise		$ 97,374	$ 71,762	$ 58,001
Commission income		19,114	16,323	13,805
Corporate-owned stores		104,721	98,390	85,041
Equipment		157,032	144,062	122,930
Total revenue		378,241	330,537	279,777
Operating costs and expenses:
Cost of revenue		122,317	113,492	100,306
Store operations		60,121	57,485	49,476
Selling, general and administrative		50,008	55,573	35,121
Depreciation and amortization		31,502	32,158	32,341
Other (gain) loss		(1,369)	(273)	994
Total operating costs and expenses		262,579	258,435	218,238
Income from operations		115,662	72,102	61,539
Other expense, net:
Interest expense, net		(27,125)	(24,549)	(21,800)
Other income (expense)		1,371	(275)	(1,261)
Total other expense, net		(25,754)	(24,824)	(23,061)
Income before income taxes		89,908	47,278	38,478
Provision for income taxes		18,661	9,148	1,183
Net income		71,247	38,130	37,295
Less net income attributable to non-controlling interests		49,747	19,612	487
Net income attributable to Planet Fitness, Inc.		$ 21,500	$ 18,518	$ 36,808
Class A Common Stock [Member]
Net income per share of Class A common stock:
Basic	[1]	$ 0.50	$ 0.11
Diluted	[1]	$ 0.50	$ 0.11
Weighted-average shares of Class A common stock outstanding:
Basic	[1]	43,300,288	36,244,000
Diluted	[1]	43,304,685	36,244,000

[1] For the year ended December 31, 2015, represents earnings per share of Class A common stock and weighted-average shares of Class A common stock outstanding for the period from August 6, 2015 through December 31, 2015, the period following the recapitalization transactions and IPO (see Note 14).