Condensed Consolidated Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net operating revenues	$ 1,414,632	$ 1,324,631
Costs and expenses:
Cost of services, exclusive of depreciation and amortization	1,200,371	1,132,092
General and administrative	33,831	28,677
Depreciation and amortization	51,752	52,138
Total costs and expenses	1,285,954	1,212,907
Income from operations	128,678	111,724
Other income and expense:
Equity in earnings of unconsolidated subsidiaries	2,588	4,366
Gain on sale of businesses	7,201	6,532
Interest expense	(46,107)	(50,811)
Income before income taxes	92,360	71,811
Income tax expense	21,912	18,467
Net income	70,448	53,344
Less: Net income attributable to non-controlling interests	17,323	12,510
Net income attributable to Select Medical Holdings Corporation	$ 53,125	$ 40,834
Earnings per common share (Note 10):
Basic (in dollars per share)	$ 0.40	$ 0.30
Diluted (in dollars per share)	$ 0.40	$ 0.30