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Description of Business - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 1999 | Nov. 15, 2016 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2011 | Dec. 31, 2018 | Jul. 31, 2016 | Jun. 04, 2014
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  | $ 155,000 | $ 0 |  |  |  |
Initial Fixed Term Of Amended and Restated Management and Administrative Services Agreement | 30 years |  |  |  |  |  |  |
ApolloMed [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 4.89% |  |  | 4.82% |  |
Concourse Diagnostic Surgery Center, LLC [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 41.59% |  | 43.43% |
Payments to Acquire Equity Method Investments |  |  |  |  | $ 600,000 |  |  |
Universal Care Acquisition Partners, LLC [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  | 100.00%
International Cancer Center ICC" [Member] |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 400,000 |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 40.00% |  |  |  |  |  |

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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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