Real Estate Assets - Real Estate Assets Owned by Partnership (Parenthetical) (Details) - Site	Sep. 30, 2018	Dec. 31, 2017
Gardner, KS and Richland County, SC [Member] \| Omaha, NE [Member]
Real Estate [Line Items]
Land development costs, consisted for number of sites	1	1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration