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Business Acquisitions - Additional Information (Detail) $ in Millions	6 Months Ended
	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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- Definition

Number of maternal-fetal medicine practices acquired.

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Number of neonatology practices acquired.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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The amount of identifiable intangible assets recognized as of the acquisition date.

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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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