Income per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted income per common share

	For the Year Ended December 31,
	2015		2016		2017
	(in thousands, except per share amounts)
Numerator:
Net income attributable to Select Medical Holdings Corporation	$	130,736	$	115,411	$	177,184
Less: Earnings allocated to unvested restricted stockholders	3,830		3,521		5,758
Net income available to common stockholders	$	126,906	$	111,890	$	171,426
Denominator:
Weighted average shares—basic	127,478		127,813		128,955
Effect of dilutive securities:
Stock options	274		155		171
Weighted average shares—diluted	127,752		127,968		129,126
Basic income per common share:	$	1.00	$	0.88	$	1.33
Diluted income per common share:	$	0.99	$	0.87	$	1.33