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Business Acquisitions - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Number
Dec. 31, 2018
USD ($)
Number
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]      
Total business acquisition consideration $ 112.0 $ 111.8  
Contingent consideration payments related to prior-period acquisitions 11.3 $ 6.4  
Goodwill deductible for tax purposes $ 98.1    
Assets held for sale     $ 46.0
Sale of equity method investments   49.00%  
Number Of Physician Group Practices Acquired | Number 9 9  
Number Of Neonatology Practices Acquired | Number 2 2  
Number Of Pediatric Subspecialty Practices Acquired | Number 4 2  
Number Of Radiology Practices Acquired | Number 1 5  
Number Of Maternal-fetal Medicine Practices Acquired | Number 2    
Change in the fair value of a contingent consideration   $ 5.3  
Accrued Purchase Consideration $ 0.3    
Purchase consideration payments related to prior-period acquisitions   1.2  
Physician Group [Member]      
Business Acquisition [Line Items]      
Goodwill 98.1 95.0  
Other intangible assets 14.0 17.2  
Fixed assets 0.2    
Change in the fair value of a contingent consideration $ 6.6    
Decrease in current assets   1.7  
Other Liabilities   2.1  
Prior Period Acquisitions [Member]      
Business Acquisition [Line Items]      
Decrease in current assets   1.2  
Net increase in goodwill resulting from finalization of tax acquisition accounting   4.0  
Additional cash consideration related to a working capital true up   1.5  
Decrease in noncurrent assets   1.5  
Decrease in liabilities   $ 0.2