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Revenue - Additional Information (Detail) - CARES Act [Member] - Medicare [Member] - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Expected repayment period | 12 months |  |
Repayment of advanced payments period | 2021-04 |  |
CMS' Accelerated and Advance Payment Program [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Amount of advance payment received | $ 45,000,000 |  |
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 Company’s new Medicare claims. |  |
Expected repayment period | 12 months |  |
Repayment of advanced payments period | 2021-04 |  |
CMS' Accelerated and Advance Payment Program [Member] | Other Accrued Liabilities [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract liabilities |  | $ 35,900 | $ 35,900
CMS' Accelerated and Advance Payment Program [Member] | Other Liabilities [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Contract liabilities |  | $ 11,300 | $ 11,300

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