Subsequent Events	12 Months Ended
Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Acquisition of U.S. HealthWorks and Financing On October 23, 2017, Select announced that Concentra Group Holdings entered into an Equity Purchase and Contribution Agreement (the “Purchase Agreement”) dated October 22, 2017 with Concentra, Concentra Group Holdings Parent, LLC (“Concentra Group Holdings Parent”), U.S. HealthWorks, and Dignity Health Holding Company (“DHHC”). On February 1, 2018, pursuant to the terms of the Purchase Agreement, Concentra acquired all of the issued and outstanding shares of stock of U.S. HealthWorks, an occupational medicine and urgent care service provider. For the year ended December 31, 2017, $2.8 million of U.S. HealthWorks acquisition costs were recognized in general and administrative expense. In connection with the closing of the transaction, Concentra Group Holdings redeemed certain of its outstanding equity interests from existing minority equity holders and subsequently, Concentra Group Holdings and a wholly owned subsidiary of Concentra Group Holdings Parent merged, with Concentra Group Holdings surviving the merger and becoming a wholly owned subsidiary of Concentra Group Holdings Parent. As a result of the merger, the equity interests of Concentra Group Holdings outstanding after the redemption described above were exchanged for membership interests in Concentra Group Holdings Parent. Concentra acquired U.S. HealthWorks for $753.0 million. DHHC, a subsidiary of Dignity Health, was issued a 20% equity interest in Concentra Group Holdings Parent, which was valued at $238.0 million. Select retained a majority voting interest in Concentra Group Holdings Parent following the closing of the transaction. The U.S. HealthWorks acquisition is being accounted for under the provisions of ASC 805, Business Combinations. The Company will allocate the purchase price to tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values. The assessment of the acquisition-date fair values of the assets acquired and the liabilities assumed and the determination of estimated useful lives of long-lived assets and finite-lived intangibles are pending the completion of appraisals; therefore, the Company is unable to disclose the purchase price allocation or pro forma results of operations for the year ended December 31, 2017. On February 1, 2018, in connection with the transactions contemplated under the Purchase Agreement, Concentra amended the Concentra first lien credit agreement to, among other things, provide for (i) an additional $555.0 million in tranche B term loans that, along with the existing tranche B term loans under the Concentra first lien credit agreement, have a maturity date of June 1, 2022 and (ii) an additional $25.0 million to the $50.0 million, five-year revolving credit facility under the terms of the existing Concentra first lien credit agreement. The tranche B term loans bear interest at a rate equal to the Adjusted LIBO Rate (as defined in the Concentra first lien credit agreement) plus 2.75% (subject to an Adjusted LIBO Rate floor of 1.00%) for Eurodollar Borrowings (as defined in the Concentra first lien credit agreement), or Alternate Base Rate (as defined in the Concentra first lien credit agreement) plus 1.75% (subject to an Alternate Base Rate floor of 2.00%) for ABR Borrowings (as defined in the Concentra first lien credit agreement). All other material terms and conditions applicable to the original tranche B term loan commitments are applicable to the additional tranche B term loans created under this amendment. In addition, Concentra entered into a second lien credit agreement (the “Concentra 2018 second lien credit agreement”) that provides for $240.0 million in term loans with an initial maturity date of June 1, 2023. Borrowings under the Concentra 2018 second lien credit agreement will bear interest at a rate equal to the Adjusted LIBO Rate (as defined in the Concentra 2018 second lien credit agreement) plus 6.50% (subject to an Adjusted LIBO Rate floor of 1.00%), or Alternate Base Rate (as defined in the Concentra 2018 second lien credit agreement) plus 5.50% (subject to an Alternate Base Rate floor of 2.00%). Concentra used borrowings under the Concentra first lien credit agreement and the Concentra 2018 second lien credit agreement, together with cash on hand, to pay the purchase price for all of the issued and outstanding stock of U.S. HealthWorks to DHHC and to finance the redemption and reorganization transactions contemplated by the Purchase Agreement (as described above).

Subsequent Events

Acquisition of U.S. HealthWorks and Financing

On October 23, 2017, Select announced that Concentra Group Holdings entered into an Equity Purchase and Contribution Agreement (the “Purchase Agreement”) dated October 22, 2017 with Concentra, Concentra Group Holdings Parent, LLC (“Concentra Group Holdings Parent”), U.S. HealthWorks, and Dignity Health Holding Company (“DHHC”). On February 1, 2018, pursuant to the terms of the Purchase Agreement, Concentra acquired all of the issued and outstanding shares of stock of U.S. HealthWorks, an occupational medicine and urgent care service provider. For the year ended December 31, 2017, $2.8 million of U.S. HealthWorks acquisition costs were recognized in general and administrative expense.

In connection with the closing of the transaction, Concentra Group Holdings redeemed certain of its outstanding equity interests from existing minority equity holders and subsequently, Concentra Group Holdings and a wholly owned subsidiary of Concentra Group Holdings Parent merged, with Concentra Group Holdings surviving the merger and becoming a wholly owned subsidiary of Concentra Group Holdings Parent. As a result of the merger, the equity interests of Concentra Group Holdings outstanding after the redemption described above were exchanged for membership interests in Concentra Group Holdings Parent.

Concentra acquired U.S. HealthWorks for $753.0 million. DHHC, a subsidiary of Dignity Health, was issued a 20% equity interest in Concentra Group Holdings Parent, which was valued at $238.0 million. Select retained a majority voting interest in Concentra Group Holdings Parent following the closing of the transaction.

The U.S. HealthWorks acquisition is being accounted for under the provisions of ASC 805, Business Combinations. The Company will allocate the purchase price to tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values. The assessment of the acquisition-date fair values of the assets acquired and the liabilities assumed and the determination of estimated useful lives of long-lived assets and finite-lived intangibles are pending the completion of appraisals; therefore, the Company is unable to disclose the purchase price allocation or pro forma results of operations for the year ended December 31, 2017.

On February 1, 2018, in connection with the transactions contemplated under the Purchase Agreement, Concentra amended the Concentra first lien credit agreement to, among other things, provide for (i) an additional $555.0 million in tranche B term loans that, along with the existing tranche B term loans under the Concentra first lien credit agreement, have a maturity date of June 1, 2022 and (ii) an additional $25.0 million to the $50.0 million, five-year revolving credit facility under the terms of the existing Concentra first lien credit agreement. The tranche B term loans bear interest at a rate equal to the Adjusted LIBO Rate (as defined in the Concentra first lien credit agreement) plus 2.75% (subject to an Adjusted LIBO Rate floor of 1.00%) for Eurodollar Borrowings (as defined in the Concentra first lien credit agreement), or Alternate Base Rate (as defined in the Concentra first lien credit agreement) plus 1.75% (subject to an Alternate Base Rate floor of 2.00%) for ABR Borrowings (as defined in the Concentra first lien credit agreement). All other material terms and conditions applicable to the original tranche B term loan commitments are applicable to the additional tranche B term loans created under this amendment.

In addition, Concentra entered into a second lien credit agreement (the “Concentra 2018 second lien credit agreement”) that provides for $240.0 million in term loans with an initial maturity date of June 1, 2023. Borrowings under the Concentra 2018 second lien credit agreement will bear interest at a rate equal to the Adjusted LIBO Rate (as defined in the Concentra 2018 second lien credit agreement) plus 6.50% (subject to an Adjusted LIBO Rate floor of 1.00%), or Alternate Base Rate (as defined in the Concentra 2018 second lien credit agreement) plus 5.50% (subject to an Alternate Base Rate floor of 2.00%).

Concentra used borrowings under the Concentra first lien credit agreement and the Concentra 2018 second lien credit agreement, together with cash on hand, to pay the purchase price for all of the issued and outstanding stock of U.S. HealthWorks to DHHC and to finance the redemption and reorganization transactions contemplated by the Purchase Agreement (as described above).