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Business Acquisitions - Additional Information (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2016
USD ($)
Company
Business Acquisition [Line Items]  
Number of physician group practices acquired | Company 12
Number of anesthesiology practices acquired | Company 7
Number of other pediatric subspecialty practices acquired | Company 2
Number of neonatology practices acquired | Company 1
Business acquisition number of entities acquired | Company 14
Total business acquisition consideration, net of cash acquired $ 722.2
Cash acquired from acquisition 15.0
Cash payments to acquire businesses 718.7
Contingent consideration liability $ 3.5
Number of maternal-fetal medicine practices acquired | Company 1
Number of pediatric cardiology practices acquired | Company 1
Number of third-party receivables companies acquired | Company 1
Number of patient engagement software company acquired | Company 1
Goodwill deductible for tax purpose $ 151.1
Additional cash payment for prior-period acquisitions 9.0
Prior-Period Acquisitions [Member]  
Business Acquisition [Line Items]  
Additional cash payment for prior-period acquisitions 6.2
Increase in deferred tax assets 19.9
Decrease to goodwill resulting from finalization of tax acquisition accounting (11.0)
Decrease in current assets 0.2
Increase in deferred tax liabilities $ 2.5
Contingent Consideration [Member]  
Business Acquisition [Line Items]  
Time period for achievement of certain performance measures for payment of contingent consideration, years 5 years
Assumed payment probability of contingent consideration payment 100.00%
Range of the undiscounted amount under contingent consideration agreement, low $ 0.0
Range of the undiscounted amount under contingent consideration agreement, high $ 4.1
Minimum [Member] | Contingent Consideration [Member]  
Business Acquisition [Line Items]  
Assumed discount rates for acquisition-date fair value 4.50%
Maximum [Member] | Contingent Consideration [Member]  
Business Acquisition [Line Items]  
Assumed discount rates for acquisition-date fair value 5.30%