Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net operating revenues	$ 1,267,401	$ 1,077,014	$ 3,816,575	$ 3,270,996
Costs and expenses:
Cost of services	1,087,062	939,079	3,247,606	2,788,411
General and administrative	29,975	27,065	90,951	83,415
Depreciation and amortization	50,527	38,772	149,022	119,644
Total costs and expenses	1,167,564	1,004,916	3,487,579	2,991,470
Income (loss) from operations	99,837	72,098	328,996	279,526
Other income and expense:
Loss on early retirement of debt			(10,255)	(19,719)
Equity in earnings of unconsolidated subsidiaries	5,432	4,431	14,914	15,618
Non-operating gain	2,139	0	9,016	(49)
Interest expense	(50,669)	(37,688)	(147,991)	(116,196)
Income (loss) before income taxes	56,739	38,841	194,680	159,180
Income tax expense	14,060	14,017	47,460	59,593
Net income	42,679	24,824	147,220	99,587
Less: Net income attributable to non-controlling interests	9,762	6,362	34,053	23,200
Net income attributable to Select Medical Holdings Corporation and Select Medical Corporation	$ 32,917	$ 18,462	$ 113,167	$ 76,387
Income per common share:
Basic (in dollars per share)	$ 0.24	$ 0.14	$ 0.84	$ 0.57
Diluted (in dollars per share)	$ 0.24	$ 0.14	$ 0.84	$ 0.57
Weighted average shares outstanding:
Basic (in shares)	130,387	129,142	129,972	128,745
Diluted (in shares)	130,447	129,322	130,066	128,916
Select Medical Corporation
Net operating revenues	$ 1,267,401	$ 1,077,014	$ 3,816,575	$ 3,270,996
Costs and expenses:
Cost of services	1,087,062	939,079	3,247,606	2,788,411
General and administrative	29,975	27,065	90,951	83,415
Depreciation and amortization	50,527	38,772	149,022	119,644
Total costs and expenses	1,167,564	1,004,916	3,487,579	2,991,470
Income (loss) from operations	99,837	72,098	328,996	279,526
Other income and expense:
Loss on early retirement of debt			(10,255)	(19,719)
Equity in earnings of unconsolidated subsidiaries	5,432	4,431	14,914	15,618
Non-operating gain	2,139	0	9,016	(49)
Interest expense	(50,669)	(37,688)	(147,991)	(116,196)
Income (loss) before income taxes	56,739	38,841	194,680	159,180
Income tax expense	14,060	14,017	47,460	59,593
Net income	42,679	24,824	147,220	99,587
Less: Net income attributable to non-controlling interests	9,762	6,362	34,053	23,200
Net income attributable to Select Medical Holdings Corporation and Select Medical Corporation	$ 32,917	$ 18,462	$ 113,167	$ 76,387