Long-Term Debt and Notes Payable - Loss on Early Retirement of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Long-term debt and notes payable
Loss on early retirement of debt	$ (19,719)	$ (11,626)	$ 0
Term loan | Select Excluding Concentra | Credit facility | 2011 Select Credit Facilities
Long-term debt and notes payable
Loss on early retirement of debt	(6,500)	(800)
Loss on debt modification	$ (13,200)
Term loan | Concentra Inc | Credit facility | Second Lien Credit Agreement
Long-term debt and notes payable
Loss on early retirement of debt		$ (10,900)