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Business Acquisitions - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) Number
Business Acquisition [Line Items]
Total business acquisition consideration	$ 4.3
Contingent consideration payments related to prior-period acquisitions	$ 1.4
Number Of Neonatology Practices Acquired | Number	1
Physician Group [Member]
Business Acquisition [Line Items]
Goodwill	$ 4.1
Other intangible assets	0.2
Change in the fair value of a contingent consideration	$ 4.0

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- Definition

Number of neonatology practices acquired.

+ References

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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.

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
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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)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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- Definition

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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