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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