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Business Combinations - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Number
Dec. 31, 2020
USD ($)
Number
Business Acquisition [Line Items]    
Number of Pediatric Neurology Practices Acquired | Number 2  
Number of Maternal Fetal Medicine Practices Acquired | Number 1  
Number Of Pediatric Intensivist Practice Acquired | Number 1  
Number Of Obstetrics And Gynecology Practices Acquired | Number 1  
Number Of Physician Group Practices Acquired | Number 9  
Number Of Neonatology Practices Acquired | Number 1  
Number Of Pediatric Subspecialty Practices Acquired | Number 1 1
Number Of Pediatric Cardiology Acquired | Number 1  
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
Multi Location Pediatric Urgent Care Practice [Member]    
Business Acquisition [Line Items]    
Number of other pediatric orthopedic practice acquired | Number 1  
Pediatric Orthopedic Multi Location Urgent Care Cardiology Neurology And Maternal Fetal Medicine Practice [Member]    
Business Acquisition [Line Items]    
Total business acquisition consideration $ 34.9  
Goodwill 27.9  
Other intangible assets 3.5  
Fixed assets 3.5  
Business acquisition consiideration paid in cash 29.9  
Business acquisitions contingent consideration liability $ 5.0