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Revenue - Additional Information (Detail) - CARES Act [Member] - Medicare [Member] - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Apr. 30, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Repayment of advanced payments period | 2022-09 |  |  |
Repayment of advanced payments |  | $ 10.0 | $ 7.0 |
CMS' Accelerated and Advance Payment Program [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Amount of advance payment received | $ 45.0 |  |  |
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 $7 million and $10 million of the $45 million of advance payments during the second and third quarters of 2021, respectively, via recoupment from the Company’s new Medicare claims and will continue to repay the remaining balance on a monthly basis through September 2022. |  |  |
Repayment of advanced payments period | 2022-09 |  |  |
Repayment of advanced payments |  | 10.0 | $ 7.0 |
CMS' Accelerated and Advance Payment Program [Member] | Other Accrued Liabilities [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract liabilities |  | $ 32.9 |  | $ 35.9
CMS' Accelerated and Advance Payment Program [Member] | Other Liabilities [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract liabilities |  |  |  | $ 11.3

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