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Business Acquisitions - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) Number
Business Acquisition [Line Items]
Total business acquisition consideration	$ 31.5
Contingent consideration payments related to prior-period acquisitions	$ 9.5
Number Of Neonatology Practices Acquired | Number	2
Number Of Maternal-fetal Medicine Practices Acquired | Number	2
Number Of Pediatric Multi Specialty Practices Acquired | Number	2
Cash consideration	$ 31.2
Accrued Purchase Consideration	0.3
Physician Group [Member]
Business Acquisition [Line Items]
Goodwill	22.7
Other intangible assets	8.8
Change in the fair value of a contingent consideration	$ (6.6)

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Number of maternal-fetal medicine practices acquired.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Cash outflow representing an adjustment to the purchase price of a previous acquisition.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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