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Organization and Summary of Accounting Policies - Schedule of Revenues by Service Type (Details) - Revenue Source - Revenue	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	100.00%	100.00%	100.00%
Patient service revenues
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	98.70%	98.40%	98.10%
Surgical Facility Services
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	95.30%	94.10%	93.60%
Ancillary Services
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	3.40%	4.30%	4.50%
Other service revenues
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	1.30%	1.60%	1.90%
Optical Services
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	0.20%	0.20%	0.50%
Other
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	1.10%	1.40%	1.40%

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