Debt - Additional Information (Details) - Mortgages notes payable - Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
13 Communities Held For Sale
Debt Instrument [Line Items]
Long term mortgage debt	$ 31.2
15 Communities Held For Sale
Debt Instrument [Line Items]
Long term mortgage debt		$ 30.1