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Revenue - Additional Information (Detail) - Medicare [Member] - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2020
Mar. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Additional repayment of advanced payments   $ 8.0  
CARES Act [Member]      
Disaggregation of Revenue [Line Items]      
Repayment of advanced payments   25.0  
CARES Act [Member] | 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. Of the $45 million of advance payments received in 2020, the Company repaid approximately $25 million of advance payments during 2021 and made additional payments of approximately $8 million during the three months ended March 31, 2022. The Company will continue to repay the remaining balance throughout the rest of 2022.    
Repayment of advanced payments period 2020    
Repayment of advanced payments   25.0 $ 45.0
Additional repayment of advanced payments   8.0  
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member] | Other Accrued Liabilities [Member]      
Disaggregation of Revenue [Line Items]      
Contract liabilities   $ 26.3 $ 30.4