Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	700,000,000	700,000,000
Common stock, shares issued (in shares)	134,104,286	134,114,715
Common stock, shares outstanding (in shares)	134,104,286	134,114,715
Select Medical Corporation
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100