Summary of Significant Accounting Policies - Properties Held-for-sale (Details)	Mar. 31, 2018 property
Letter of intent \| Properties held-for-sale \| Subsequent Event
Real Estate Investments
Number of properties	6

The number of real estate properties owned as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant