Discontinued Operations - Summary of Results of Discontinued Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Medical services revenue	$ 6,444	$ 155,296	$ 209,926
Income (loss) from operations	(1,475)	(17,348)	(168,263)
Other income (expense), net	(1,851)	(2,351)	(15,177)
Gain (loss) on sales of assets, net	473	20,401	0
Interest expense	(137)	(350)	(1,011)
Income (loss) before income taxes and noncontrolling interests	(2,990)	352	(184,451)
Income tax benefit (expense)	1,687	2,804	16,166
Income (loss) from discontinued operations	(1,303)	3,156	(168,285)
Noncontrolling interests' share of earnings	0	0	152
Net income (loss) from discontinued operations attributable to common shares	(1,303)	3,156	(168,133)
Medical Services Revenue
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Medical services revenue	6,408	155,108	209,799
Other Operating Revenue
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Medical services revenue	36	188	127
Medical Services Expense
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairments (recoveries)	(865)	84,189	123,850
Other Medical Expenses
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairments (recoveries)	2,739	57,546	79,423
General And Administrative
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairments (recoveries)	5,919	30,341	47,413
Depreciation And Amortization
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairments (recoveries)	126	568	29,160
Impairments Recoveries
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairments (recoveries)	$ 0	$ 0	$ 98,343