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Business Acquisitions - Additional Information (Detail)
$ in Millions
 12 Months Ended
Mar. 31, 2017
Dec. 31, 2018
USD ($)
Company
Dec. 31, 2017
Company
Business Acquisition [Line Items]      
Number of physician group practices acquired | Company   9 10
Number of neonatology practices acquired | Company   2 1
Number of other pediatric subspecialty practices acquired | Company   2 2
Number of radiology practices acquired | Company   5 4
Total business acquisition consideration   $ 111.8  
Contingent consideration payments related to prior-period acquisitions   6.4  
Purchase consideration payments related to prior-period acquisitions   1.2  
Change in the fair value of a contingent consideration   (5.3)  
Assets held for sale   $ 46.0  
Sale of equity method investments   49.00%  
Number of maternal-fetal medicine practices acquired | Company     2
Number of pediatric multi-specialty practice acquired | Company     1
Sale of minority interest percentage 75.00%    
Deconsolidation percentage 100.00%    
Physician Group [Member]      
Business Acquisition [Line Items]      
Goodwill   $ 95.0  
Other intangible assets   17.2  
Decrease in current assets   1.7  
Other liabilities   2.1  
Prior-Period Acquisitions [Member]      
Business Acquisition [Line Items]      
Decrease in current assets   1.2  
Decrease in noncurrent assets   1.5  
Decrease in noncurrent liabilities   0.2  
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