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Business Acquisitions - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
Company
shares
Business Acquisition [Line Items]  
Number of physician group practices acquired | Company 5
Number of neonatology practices acquired | Company 1
Number of maternal-fetal medicine practices acquired | Company 1
Number of pediatric subspecialty practices acquired | Company 1
Number of pediatric opthalmology practices acquired | Company 1
Number of radiology practices acquired | Company 1
Total business acquisition consideration $ 112.9
Cash payments to acquire businesses 110.9
Payments to acquire business by issue of common stock $ 0.5
Number of shares of common stock issued | shares 8,804
Purchase consideration liability $ 1.5
Contractual restriction period on disposition or assignment of common stock 3 years
Goodwill deductible for tax purposes $ 45.4
Contingent consideration payments related to prior-period acquisitions $ 0.5
Sale of minority interest percentage 75.00%
Deconsolidation percentage 100.00%
Prior-Period Acquisitions [Member]  
Business Acquisition [Line Items]  
Increase in deferred tax liabilities $ 0.5
Increase in goodwill resulting from finalization of tax acquisition accounting $ 0.5