Related Party Arrangements - Narrative - Acquisition Fees and Expenses (Details) - Advisor [Member] - Advisor [Member] - Acquisition Fees and Expenses [Member]	12 Months Ended
Dec. 31, 2018
Related Party Transaction [Line Items]
Acquisition fee, percentage of purchase price of real property or related asset	2.00%
Acquisition fees and expenses, maximum, percentage of contract purchase price	6.00%

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.

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration