Organization and Summary of Accounting Policies - Schedule of Revenues by Service Type (Details) - Revenue Source - Revenue	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	100.00%		100.00%
Healthcare Organization, Patient Service
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	98.50%		98.10%
Surgical facility services
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	94.30%		93.60%
Ancillary services
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	4.20%		4.50%
Healthcare Organization, Other Service
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	1.50%		1.90%
Optical services
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	0.60%		0.50%
Other
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues	0.90%		1.40%
Predecessor
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues		100.00%		100.00%
Predecessor | Healthcare Organization, Patient Service
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues		98.40%		98.20%
Predecessor | Surgical facility services
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues		91.40%		90.30%
Predecessor | Ancillary services
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues		7.00%		7.90%
Predecessor | Healthcare Organization, Other Service
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues		1.60%		1.80%
Predecessor | Optical services
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues		1.00%		1.10%
Predecessor | Other
Revenue from External Customer [Line Items]
Revenue by service type as a percentage of total revenues		0.60%		0.70%