Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Reconciliation of Numerators and Denominators Used to Compute Basic and Diluted Earnings per Share

The following table sets forth reconciliations used to compute basic and diluted earnings per share of Class A common stock:  

	Three months ended September 30,				Nine months ended September 30,
	2019		2018		2019		2018
Numerator
Net income	$	29,692	$	20,472	$	101,158	$	74,384
Less: net income attributable to non-controlling interests	3,915		3,001		13,128		11,158
Net income attributable to Planet Fitness, Inc.	$	25,777	$	17,471	$	88,030	$	63,226
Denominator
Weighted-average shares of Class A common stock outstanding - basic	83,157,430		88,047,401		83,699,609		87,727,300
Effect of dilutive securities:
Stock options	606,888		382,499		609,788		319,610
Restricted stock units	42,588		27,904		44,775		17,141
Weighted-average shares of Class A common stock outstanding - diluted	83,806,906		88,457,804		84,354,172		88,064,051
Earnings per share of Class A common stock - basic	$	0.31	$	0.20	$	1.05	$	0.72
Earnings per share of Class A common stock - diluted	$	0.31	$	0.20	$	1.04	$	0.72