Organization and Summary of Accounting Policies - Organization (Details)	Sep. 30, 2020 surgical_facilities state
Products And Services [Line Items]
Number of surgical facilities owned	126
Number of states in which entity operates | state	30
Number of surgical facilities owned, majority interest	84
Number of surgical facilities owned, consolidated	106
Facilities, Ambulatory Surgery Centers
Products And Services [Line Items]
Number of surgical facilities owned	110
Facilities, Surgical Hospitals
Products And Services [Line Items]
Number of surgical facilities owned	16