Condensed consolidated statements of operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Revenue	$ 181,661	$ 140,550	$ 330,478	$ 261,882
Operating costs and expenses:
Cost of revenue	54,391	36,744	88,877	63,244
Store operations	20,163	18,047	41,068	36,403
Selling, general and administrative	18,864	17,210	37,018	34,831
Depreciation and amortization	10,577	8,619	20,484	17,084
Other (gain) loss	(122)	(39)	246	971
Total operating costs and expenses	116,395	91,739	212,027	174,153
Income from operations	65,266	48,811	118,451	87,729
Other expense, net:
Interest income	1,979	418	3,777	455
Interest expense	(14,636)	(9,046)	(29,385)	(17,816)
Other expense	(1,444)	(502)	(4,762)	(310)
Total other expense, net	(14,101)	(9,130)	(30,370)	(17,671)
Income before income taxes	51,165	39,681	88,081	70,058
Provision for income taxes	11,338	9,263	16,615	16,146
Net income	39,827	30,418	71,466	53,912
Less net income attributable to non-controlling interests	4,983	4,544	9,213	8,157
Net income attributable to Planet Fitness, Inc.	$ 34,844	$ 25,874	$ 62,253	$ 45,755
Class A Common Stock
Net income per share of Class A common stock:
Basic (in dollars per share)	$ 0.41	$ 0.30	$ 0.74	$ 0.52
Diluted (in dollars per share)	$ 0.41	$ 0.29	$ 0.74	$ 0.52
Weighted-average shares of Class A common stock outstanding:
Basic (in shares)	84,142,975	87,693,377	83,975,192	87,564,596
Diluted (in shares)	84,835,183	88,105,331	84,638,650	87,931,469
Franchise
Revenue:
Revenue	$ 58,225	$ 45,417	$ 111,181	$ 87,579
Commission income
Revenue:
Revenue	1,065	1,575	2,059	3,563
National advertising fund
Revenue:
Revenue	12,522	11,158	24,334	21,620
Operating costs and expenses:
Cost of revenue	12,522	11,158	24,334	21,620
Corporate-owned stores
Revenue:
Revenue	39,695	34,252	77,739	66,959
Equipment
Revenue:
Revenue	$ 70,154	$ 48,148	$ 115,165	$ 82,161