Financial Information for Subsidiary Guarantors and Non-Guarantor Subsidiaries under Select's 6.375% Senior Notes - Consolidating Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Consolidating Statement of Operations
Net operating revenues	$ 1,039,205	$ 1,021,123	$ 887,065	$ 795,343	$ 771,608	$ 758,069	$ 772,762	$ 762,578	$ 3,742,736	$ 3,065,017	$ 2,975,648
Costs and expenses:
Cost of services									3,211,541	2,582,340	2,495,476
General and administrative									92,052	85,247	76,921
Bad debt expense									59,372	44,600	37,423
Depreciation and amortization									104,981	68,354	64,392
Total costs and expenses									3,467,946	2,780,541	2,674,212
Income (loss) from operations	62,300	48,214	85,011	79,265	57,822	66,017	82,193	78,444	274,790	284,476	301,436
Other income and expense:
Gain on sale of equity investment									29,647
Equity in earnings of unconsolidated subsidiaries									16,811	7,044	2,476
Loss on early retirement of debt										(2,277)	(18,747)
Interest expense									(112,816)	(85,446)	(87,364)
Income before income taxes									208,432	203,797	197,801
Income tax expense (benefit)									72,436	75,622	74,792
Net income									135,996	128,175	123,009
Less: Net income attributable to non-controlling interests									5,260	7,548	8,619
Net income attributable to Select Medical Holdings Corporation and Select Medical Corporation	29,327	29,406	36,940	35,063	25,712	26,530	35,341	33,044	130,736	120,627	114,390
Select
Condensed Consolidating Statement of Operations
Net operating revenues	1,039,205	1,021,123	887,065	795,343	771,608	758,069	772,762	762,578	3,742,736	3,065,017	2,975,648
Costs and expenses:
Cost of services									3,211,541	2,582,340	2,495,476
General and administrative									92,052	85,247	76,921
Bad debt expense									59,372	44,600	37,423
Depreciation and amortization									104,981	68,354	64,392
Total costs and expenses									3,467,946	2,780,541	2,674,212
Income (loss) from operations	62,300	48,214	85,011	79,265	57,822	66,017	82,193	78,444	274,790	284,476	301,436
Other income and expense:
Gain on sale of equity investment									29,647
Equity in earnings of unconsolidated subsidiaries									16,811	7,044	2,476
Loss on early retirement of debt										(2,277)	(17,788)
Interest expense									(112,816)	(85,446)	(84,954)
Income before income taxes									208,432	203,797	201,170
Income tax expense (benefit)									72,436	75,622	75,971
Net income									135,996	128,175	125,199
Less: Net income attributable to non-controlling interests									5,260	7,548	8,619
Net income attributable to Select Medical Holdings Corporation and Select Medical Corporation	$ 29,327	$ 29,406	$ 36,940	$ 35,063	$ 25,712	$ 26,530	$ 35,341	$ 33,044	130,736	120,627	116,580
Select | Reportable legal entities | Select Medical Corporation (Parent Company Only)
Condensed Consolidating Statement of Operations
Net operating revenues									724	721	350
Costs and expenses:
Cost of services									2,029	2,015	1,757
General and administrative									88,227	86,311	76,709
Depreciation and amortization									4,292	3,723	3,746
Total costs and expenses									94,548	92,049	82,212
Income (loss) from operations									(93,824)	(91,328)	(81,862)
Other income and expense:
Intercompany interest and royalty fees									(1,417)	(1,142)	(1,326)
Intercompany management fees									143,939	142,273	144,447
Loss on early retirement of debt										(2,277)	(17,788)
Interest expense									(58,350)	(57,651)	(58,100)
Income before income taxes									(9,652)	(10,125)	(14,629)
Income tax expense (benefit)									(7,869)	(4,333)	(1,238)
Equity in earnings of subsidiaries									132,520	126,419	129,971
Net income									130,737	120,627	116,580
Net income attributable to Select Medical Holdings Corporation and Select Medical Corporation									130,737	120,627	116,580
Select | Reportable legal entities | Subsidiary Guarantors
Condensed Consolidating Statement of Operations
Net operating revenues									2,673,987	2,634,480	2,576,906
Costs and expenses:
Cost of services									2,266,647	2,209,724	2,155,370
General and administrative									(890)	(1,064)	212
Bad debt expense									40,541	38,052	31,173
Depreciation and amortization									56,447	54,876	51,825
Total costs and expenses									2,362,745	2,301,588	2,238,580
Income (loss) from operations									311,242	332,892	338,326
Other income and expense:
Intercompany interest and royalty fees									1,387	1,131	836
Intercompany management fees									(119,388)	(120,528)	(125,357)
Gain on sale of equity investment									29,647
Equity in earnings of unconsolidated subsidiaries									16,719	6,958	2,384
Interest expense									(24,250)	(23,367)	(22,916)
Income before income taxes									215,357	197,086	193,273
Income tax expense (benefit)									85,907	78,748	76,837
Equity in earnings of subsidiaries									9,117	8,995	14,561
Net income									138,567	127,333	130,997
Less: Net income attributable to non-controlling interests										623	995
Net income attributable to Select Medical Holdings Corporation and Select Medical Corporation									138,567	126,710	130,002
Select | Reportable legal entities | Non-Guarantor Subsidiaries
Condensed Consolidating Statement of Operations
Net operating revenues									482,803	429,816	398,392
Costs and expenses:
Cost of services									414,518	370,601	338,349
Bad debt expense									9,240	6,548	6,250
Depreciation and amortization									10,598	9,755	8,821
Total costs and expenses									434,356	386,904	353,420
Income (loss) from operations									48,447	42,912	44,972
Other income and expense:
Intercompany interest and royalty fees									30	11	490
Intercompany management fees									(24,551)	(21,745)	(19,090)
Equity in earnings of unconsolidated subsidiaries									92	86	92
Interest expense									(6,154)	(4,428)	(3,938)
Income before income taxes									17,864	16,836	22,526
Income tax expense (benefit)									(470)	1,207	372
Net income									18,334	15,629	22,154
Less: Net income attributable to non-controlling interests									9,144	6,925	7,624
Net income attributable to Select Medical Holdings Corporation and Select Medical Corporation									9,190	8,704	14,530
Select | Reportable legal entities | Non-Guarantor Concentra
Condensed Consolidating Statement of Operations
Net operating revenues									585,222
Costs and expenses:
Cost of services									528,347
General and administrative									4,715
Bad debt expense									9,591
Depreciation and amortization									33,644
Total costs and expenses									576,297
Income (loss) from operations									8,925
Other income and expense:
Interest expense									(24,062)
Income before income taxes									(15,137)
Income tax expense (benefit)									(5,132)
Net income									(10,005)
Less: Net income attributable to non-controlling interests									(3,884)
Net income attributable to Select Medical Holdings Corporation and Select Medical Corporation									(6,121)
Select | Eliminations
Other income and expense:
Equity in earnings of subsidiaries									(141,637)	(135,414)	(144,532)
Net income									(141,637)	(135,414)	(144,532)
Net income attributable to Select Medical Holdings Corporation and Select Medical Corporation									$ (141,637)	$ (135,414)	$ (144,532)