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Description of Business - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 1999 | Nov. 15, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2011 | Sep. 01, 2018 | Dec. 31, 2017 | Jul. 31, 2016 | Jun. 04, 2014
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  | $ 200,000 | $ 0 |  |  |  |  |
Initial Fixed Term Of Amended and Restated Management and Administrative Services Agreement | 30 years |  |  |  |  |  |  |  |
Apollo Palliative Services LLC [Member] |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  | 100.00% |  |  |
ApolloMed [Member] |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 4.85% |  |  |  | 4.95% |  |
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 |  |  |  |  | $ 625,000 |  |  |  |
Universal Care Acquisition Partners, LLC [Member] |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  | 100.00%
Pacific Ambulatory Surgery Center [Member] |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 40.00% |  |  |  |  |  |
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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