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Business Acquisitions - Additional Information (Detail) $ in Millions | 12 Months Ended |
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Dec. 31, 2019 USD ($) Number | Dec. 31, 2018 USD ($) Number | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |
Total business acquisition consideration | $ 112.0 | $ 111.8 |
Contingent consideration payments related to prior-period acquisitions | 11.3 | $ 6.4 |
Goodwill deductible for tax purposes | $ 98.1 |  |
Assets held for sale |  |  | $ 46.0
Sale of equity method investments |  | 49.00% |
Number Of Physician Group Practices Acquired | Number | 9 | 9 |
Number Of Neonatology Practices Acquired | Number | 2 | 2 |
Number Of Pediatric Subspecialty Practices Acquired | Number | 4 | 2 |
Number Of Radiology Practices Acquired | Number | 1 | 5 |
Number Of Maternal-fetal Medicine Practices Acquired | Number | 2 |  |
Change in the fair value of a contingent consideration |  | $ 5.3 |
Accrued Purchase Consideration | $ 0.3 |  |
Purchase consideration payments related to prior-period acquisitions |  | 1.2 |
Physician Group [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 98.1 | 95.0 |
Other intangible assets | 14.0 | 17.2 |
Fixed assets | 0.2 |  |
Change in the fair value of a contingent consideration | $ 6.6 |  |
Decrease in current assets |  | 1.7 |
Other Liabilities |  | 2.1 |
Prior Period Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Decrease in current assets |  | 1.2 |
Net increase in goodwill resulting from finalization of tax acquisition accounting |  | 4.0 |
Additional cash consideration related to a working capital true up |  | 1.5 |
Decrease in noncurrent assets |  | 1.5 |
Decrease in liabilities |  | $ 0.2 |

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