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Investments In Unconsolidated Joint Ventures - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
May 07, 2020
Feb. 29, 2020
Mar. 31, 2020
Mar. 31, 2019
Property management expenses | Joint Venture        
Schedule of Equity Method Investments [Line Items]        
Management fee income     $ 0.9 $ 0.7
AMH HB Venture, LLC        
Schedule of Equity Method Investments [Line Items]        
Size of partnership   $ 253.1    
Ownership percentage   20.00%    
AMH HB Venture, LLC | Subsequent Event        
Schedule of Equity Method Investments [Line Items]        
Size of partnership $ 625.0