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Business Acquisitions - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Acquisition
Company
Dec. 31, 2015
USD ($)
Acquisition
Company
shares
Business Acquisition [Line Items]    
Number of physician group practices acquired | Company 13 10
Number of anesthesiology practices acquired | Company 8  
Number of other pediatric subspecialty practices acquired | Company 2  
Number of neonatology practices acquired | Company 1  
Total business acquisition consideration, net of cash acquired $ 759.6 $ 853.3
Cash payments to acquire businesses 756.1 818.3
Contingent consideration liability $ 3.5 $ 3.8
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 1
Number of patient engagement software company acquired | Company 1  
Number of business acquired | Acquisition 15 12
Cash acquired from acquisition $ 15.0 $ 23.0
Additional amounts to be paid in cash or common stock based on achievement of performance measures within period, maximum years 5 years  
Additional cash payment for prior-period acquisitions $ 11.8  
Business acquisition, other current liabilities   0.4
Payments to acquire business by issue of common stock   $ 7.8
Number of shares of common stock issued | shares   114,306
Number of teleradiology physician services acquired | Company   1
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]    
Additional amounts to be paid in cash or common stock based on achievement of performance measures within period, maximum 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%