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Business Acquisitions - Additional Information (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($) Number
Business Acquisition [Line Items] |
Total business acquisition consideration | $ 11.5
Contingent consideration payments related to prior-period acquisitions | $ 5.6
Number Of Neonatology Practices Acquired | Number | 1
Number Of Maternal-fetal Medicine Practices Acquired | Number | 2
Physician Group [Member] |
Business Acquisition [Line Items] |
Goodwill | $ 8.1
Other intangible assets | 3.4
Change in the fair value of a contingent consideration | $ 6.6

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