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Revenue - Additional Information (Detail) - CARES Act [Member] - CMS’ Accelerated and Advance Payment Program [Member] - Medicare [Member] - USD ($)
$ in Millions
 1 Months Ended
Apr. 30, 2020
Sep. 30, 2020
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, 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  
Other Accrued Liabilities [Member]    
Disaggregation of Revenue [Line Items]    
Contract liabilities   $ 24.9
Other Liabilities [Member]    
Disaggregation of Revenue [Line Items]    
Contract liabilities   $ 22.5