Long-Term Debt and Notes Payable - Excess Cash Flow Payment (Details) - Credit facilities $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($)
Select Medical Corporation \| 2017 Select Credit Facilities
Line of Credit Facility [Line Items]
Principal prepayment	$ 98.8
Concentra Inc \| Term loans
Line of Credit Facility [Line Items]
Principal prepayment	$ 33.9

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration