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Revenue - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accounts receivable, net |  |  | $ 2,448 | $ 15,340 | $ (18,714)
Cost report payable |  |  | 6,487 |  |
Cost report receivables |  |  |  | 5,818 |
Net adjustments to estimated cost report settlements resulted in (decreases) increases to revenue |  |  | (5,400) | (1,300) | 400
Costs of providing charity care services |  |  | 3,800 | 4,400 | $ 4,300
CARES Act [Member] | Medicare [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Repayment of advanced payments |  | $ 25,000 |  |  |
Repayment of advanced payments period | 2022 |  |  |  |
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member] | Medicare [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Amount of advance payment received | $ 45,000 |  |  |  |
Repayment of advanced payments |  |  | 25,000 |  |
Repayment of advanced payments description | In April 2020, the Company received approximately $45 million from CMS’ Accelerated and Advance Payment Program for Medicare providers. The Company repaid approximately $25 million of the $45 million of advance payments during 2021 via recoupment from the Company’s new Medicare claims and will continue to repay the remaining balance throughout 2022. |  |  |  |
Repayment of advanced payments period | 2022 |  |  |  |
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member] | Medicare [Member] | Other Accrued Liabilities [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities |  |  | 30,400 | 35,900 |
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member] | Medicare [Member] | Other Liabilities [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract liabilities |  |  |  | 11,300 |
Accounting Standards Update 2014-09 |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Accounts receivable, net |  |  | $ 49,700 | $ 62,100 |

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