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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Feb. 28, 2022
Summary Of Significant Accounting Policies [Line Items]      
Investment in pediatric primary, urgent care and telehealth company   $ 20.0  
Cash and cash equivalents maturity description 90    
Additional amounts to be paid in cash or common stock based on achievement of performance measures within period, maximum years 5 years    
GAAP Senior Notes [Member] | Six Point Two Five Percentage Senior Notes Due Two Thousand Twenty Seven [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Debt instrument, interest rate, effective percentage     6.25%
Unnamed Corporate Joint Venture One [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Equity method ownership percentage in joint venture 37.50%    
Unnamed Corporate Joint Venture Two [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Equity method ownership percentage in joint venture 51.00%    
Buildings [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 30 years    
United States [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Percentage of net accounts receivable 21.00% 21.00%  
Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Short-Term investments maturity period, in years 1 year    
Intangible assets finite lives 20 years    
Maximum [Member] | Medical Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 7 years    
Maximum [Member] | Computer Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 7 years    
Maximum [Member] | Software and Software Development Costs [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 7 years    
Maximum [Member] | Furniture [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 7 years    
Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Intangible assets finite lives 1 year    
Minimum [Member] | Medical Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 3 years    
Minimum [Member] | Computer Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 3 years    
Minimum [Member] | Software and Software Development Costs [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 3 years    
Minimum [Member] | Furniture [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property and equipment estimated useful lives, years 3 years