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Business Combinations - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) Number | Dec. 31, 2019 USD ($) Number
Business Acquisition [Line Items] |  |
Total business acquisition consideration |  | $ 47.0
Contingent consideration payments related to prior-period acquisitions | $ 0.0 | $ 1.8
Number Of Physician Group Practices Acquired | Number |  | 8
Number Of Neonatology Practices Acquired | Number |  | 2
Number Of Pediatric Subspecialty Practices Acquired | Number | 1 | 4
Number Of Radiology Practices Acquired | Number |  | 2
Accrued Purchase Consideration |  | $ 0.3
Physician Group [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill |  | 36.5
Other intangible assets |  | 10.5
Fixed assets |  | $ 0.2
Pediatric Subspecialty Practice [Member] |  |
Business Acquisition [Line Items] |  |
Total business acquisition consideration | $ 2.1 |
Goodwill | 0.8 |
Other intangible assets | 1.3 |
Business acquisition consiideration paid in cash | 1.9 |
Business acquisitions contingent consideration liability | $ 0.2 |

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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 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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