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The CARES Act - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 24, 2020
Aug. 31, 2020
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CARES Act [Line Items]                
Received benefit in form of refunds and lower future tax payments         $ 51,600 $ 51,600    
Received benefit related to interest expense         22,800 22,800    
Received benefit related to qualified improvement property legislation         20,500 20,500    
Expected permanent cash benefit due to loss         $ 8,300 $ 8,300    
Effective income tax rate reconciliation at federal statutory income tax rate         21.00% 21.00% 21.00% 35.00%
Other income         $ 32,819      
CARES Act [Member]                
CARES Act [Line Items]                
Offer of eligible relief amount       $ 100,000,000        
Additional offer of eligible relief amount $ 75,000,000              
Cash benefit relating to delay of payment of social security payroll taxes         $ 39,000      
Net operating loss carryforwards and carrybacks offset percentage of taxable income         100.00%      
Net operating loss carried back period         5 years      
CARES Act [Member] | Medicare [Member]                
CARES Act [Line Items]                
Percentage of increase in medicare reimbursement rate       2.00%        
CARES Act [Member] | Public Health and Social Services Emergency Fund [Member]                
CARES Act [Line Items]                
Receipt of CARES Act of 2020 aid amount       $ 19,700 $ 34,900      
Receipt of additional CARES Act of 2020 aid amount   $ 12,800            
Other income     $ 32,800          
CARES Act [Member] | CMS’ Accelerated and Advance Payment Program [Member] | Medicare [Member]                
CARES Act [Line Items]                
Amount of advance payment received       $ 45,000