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Dispositions and Acquisitions - Additional Information (Detail) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 08, 2021 Clinician AmbulatorySurgeryCenter | Sep. 30, 2021 USD ($) Bed | Sep. 30, 2020 USD ($)
Business Acquisition [Line Items] |  |  |
Aggregate cash proceeds from divestiture of businesses |  | $ 21 | $ 8
CALIFORNIA | RMCPS |  |  |
Business Acquisition [Line Items] |  |  |
Number Of ambulatory surgery centers planning to acquire | AmbulatorySurgeryCenter | 2 |  |
CALIFORNIA | RMCPS | Minimum |  |  |
Business Acquisition [Line Items] |  |  |
Number Of clinicians | Clinician | 170 |  |
Nevada |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition, cash paid |  | $ 39 |
Number of beds available in micro-hospital | Bed |  | 22 |
Nevada | Real Estate and Other Assets |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition, cash paid |  |  | $ 52

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