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Business Acquisitions - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
Company
Business Acquisition [Line Items]  
Number of physician group practices acquired | Company 4
Number of anesthesiology practices acquired | Company 2
Number of neonatology practices acquired | Company 1
Number of other pediatric subspecialty practices acquired | Company 1
Business acquisition, total consideration $ 56.8
Payments to acquire business, net of cash acquired 53.3
Contingent consideration 3.5
Goodwill 35.0
Other intangible assets 28.6
Other liabilities $ 6.8
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
Additional cash payment for prior-period acquisitions 0.5
Goodwill deductible for tax purpose 20.8
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 $ (13.7)
Minimum [Member]  
Business Acquisition [Line Items]  
Assumed discount rates for acquisition-date fair value 4.50%
Maximum [Member]  
Business Acquisition [Line Items]  
Assumed discount rates for acquisition-date fair value 5.30%