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Items] Products And Services [Line Items] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Payments to acquire equity method investments Payments to Acquire Equity Method Investments Derivatives not designated as hedging instruments Not Designated as Hedging Instrument [Member] Credit Facility [Axis] Credit Facility [Axis] Entity Address, Address Line One Entity Address, Address Line One Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Schedule of Segment Revenue and Operating Income Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Changes in operating assets and liabilities, net of acquisitions and divestitures: Increase (Decrease) in Operating Capital [Abstract] Derivative asset, notional amount Derivative Asset, Notional Amount Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Pay-fixed swap Pay-fixed Swap Four [Member] Pay-fixed Swap Four Member Principles of Consolidation Consolidation, Policy [Policy Text Block] Entity Shell Company Entity Shell Company Total current liabilities Liabilities, Current Projected tax savings period Collaborative Tax Agreement, Projected Tax Savings, Term Collaborative Tax Agreement, Projected Tax Savings, Term Total consideration Payments to Acquire Businesses, Gross Payment of preferred dividends Payments of Ordinary Dividends, Preferred Stock and Preference Stock Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Operating cash outflows from finance leases Finance Lease, Interest Payment on Liability Revenues Total revenues Revenue from Contract with Customer, Including Assessed Tax Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Current Fiscal Year End Date Current Fiscal Year End Date Less: unamortized debt issuance costs and discounts Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Net (loss) income Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Federal Funds Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Statement [Table] Statement [Table] Other current assets Other Assets, Current Medicare accelerated payments and deferred governmental grants Medicare Accelerated Payments And Deferred Governmental Grants, Current Medicare Accelerated Payments And Deferred Governmental Grants, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Unamortized fair value discount (premium) Debt Instrument, Unamortized Discount (Premium), Net Subsequent Event Subsequent Event [Member] Long-term Finance Lease, Liability, Noncurrent Goodwill, beginning of period Goodwill, end of period Goodwill Goodwill Loss recognized in income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Non-controlling interests—non-redeemable Stockholders' Equity Attributable to Noncontrolling Interest Variable and short-term lease costs Variable And Short-Term Lease, Cost Variable And Short-Term Lease, Cost Interest rate cap Interest Rate Cap One [Member] Interest Rate Cap One Professional, general and workers' compensation insurance reserve Self Insurance Reserve Schedule of Rollforward of Goodwill Schedule of Goodwill [Table Text Block] Number of surgical facilities contributed as non-cash consideration Disposal Group, Number Of Surgical Facilities Contributed As Non-Cash Consideration Disposal Group, Number Of Surgical Facilities Contributed As Non-Cash Consideration Subsequent Event Type [Axis] Subsequent Event Type [Axis] Common stock, $0.01 par value; shares authorized - 300,000,000; shares issued and outstanding - 89,904,913 and 89,332,557, respectively Common Stock, Value, Outstanding Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Deferred accrued payroll and benefits Deferred Employee-related Liabilities, Current Deferred Employee-related Liabilities, Current Collaborative tax agreement, basis spread on variable rate (percent) Collaborative Tax Agreement, Interest Rate, Basis Spread on Variable Rate Collaborative Tax Agreement, Interest Rate, Basis Spread on Variable Rate Operating lease costs Operating Lease, Cost Equity in earnings of unconsolidated affiliates, net of distributions received Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Long-Term Debt Long-term Debt [Text Block] Deferred accelerated payments Coronavirus Aid, Relief, and Economic Security Act CARES Act, Government Grants, Deferred Accelerated Payments Coronavirus Aid, Relief, and Economic Security Act CARES Act, Government Grants, Deferred Accelerated Payments Deferred income taxes Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]