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Revenue - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Accounts receivable, net |  | $ 15,340 | $ (18,714) | $ (19,702)
Cost report receivables |  | 5,818 | 13,723 |
Net adjustments to estimated cost report settlements resulted in (decreases) increases to revenue |  | (1,300) | (400) | 500
Costs of providing charity care services |  | 4,400 | 4,300 | $ 4,700
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 description | In April 2020, the Company received approximately $45 million from CMS’ Accelerated and Advance Payment Program for Medicare providers, which the Company expects to repay over the 12 month period beginning in April 2021. Once repayment begins, the amount will be recouped from the provider’s or supplier’s new Medicare claims. |  |  |
Expected repayment period | 12 months |  |  |
Repayment of advanced payments period | 2021-04 |  |  |
CARES Act [Member] | CMS’ Accelerated and Advance Payment Program [Member] | Medicare [Member] | Other Accrued Liabilities [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract liabilities |  | 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 |  | $ 62,100 | $ 45,900 |

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