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Business Acquisitions - Additional Information (Detail) $ in Millions | 12 Months Ended
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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% |

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