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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