Quarterly financial data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Data

	For the quarter ended
	March 31, 2018		June 30, 2018		September 30, 2018		December 31, 2018
Total revenue	$	121,333	$	140,550	$	136,656	$	174,359
Income from operations	38,918		48,811		43,573		52,742
Net income	23,493		30,418		20,472		28,779
Net income attributable to Planet Fitness, Inc.	19,880		25,874		17,471		24,796
Earnings per share:
Class A - Basic	$	0.23	$	0.30	$	0.20	$	0.29
Class A - Diluted	$	0.23	$	0.29	$	0.20	$	0.29
	For the quarter ended
	March 31, 2017		June 30, 2017		September 30, 2017		December 31, 2017
Total revenue	$	91,102	$	107,316	$	97,496	$	134,028
Income from operations	33,055		38,250		33,954		42,277
Net income	17,866		18,004		18,902		829
Net income (loss) attributable to Planet Fitness, Inc.	8,842		12,412		15,345		(3,453		)
Earnings (loss) per share:
Class A - Basic	$	0.14	$	0.16	$	0.18	$	(0.04	)
Class A - Diluted	$	0.14	$	0.16	$	0.18	$	(0.04	)