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Business Combinations - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Number
Dec. 31, 2019
USD ($)
Number
Business Acquisition [Line Items]    
Total business acquisition consideration   $ 47.0
Contingent consideration payments related to prior-period acquisitions $ 0.0 $ 1.8
Number Of Physician Group Practices Acquired | Number   8
Number Of Neonatology Practices Acquired | Number   2
Number Of Pediatric Subspecialty Practices Acquired | Number 1 4
Number Of Radiology Practices Acquired | Number   2
Accrued Purchase Consideration   $ 0.3
Physician Group [Member]    
Business Acquisition [Line Items]    
Goodwill   36.5
Other intangible assets   10.5
Fixed assets   $ 0.2
Pediatric Subspecialty Practice [Member]    
Business Acquisition [Line Items]    
Total business acquisition consideration $ 2.1  
Goodwill 0.8  
Other intangible assets 1.3  
Business acquisition consiideration paid in cash 1.9  
Business acquisitions contingent consideration liability $ 0.2