Condensed Consolidated Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenue	$ 1,674,528	$ 1,584,741	$ 3,339,508	$ 3,184,288
Costs and expenses:
Cost of services, exclusive of depreciation and amortization	1,423,603	1,390,550	2,842,422	2,797,560
General and administrative	42,508	37,268	84,787	74,781
Depreciation and amortization	49,939	51,081	102,364	102,120
Total costs and expenses	1,516,050	1,478,899	3,029,573	2,974,461
Other operating income	726	15,125	726	15,125
Income from operations	159,204	120,967	310,661	224,952
Other income and expense:
Equity in earnings of unconsolidated subsidiaries	10,501	6,167	19,057	11,564
Interest expense	(48,997)	(41,052)	(97,568)	(76,566)
Income before income taxes	120,708	86,082	232,150	159,950
Income tax expense	28,848	19,820	55,033	37,762
Net income	91,860	66,262	177,117	122,188
Less: Net income attributable to non-controlling interests	13,623	11,055	28,075	17,864
Net income attributable to Select Medical Holdings Corporation	$ 78,237	$ 55,207	$ 149,042	$ 104,324
Earnings per common share (Note 12):
Basic (in dollars per share)	$ 0.61	$ 0.43	$ 1.17	$ 0.79
Diluted (in dollars per share)	$ 0.61	$ 0.43	$ 1.17	$ 0.79