Real Estate (Details) $ in Millions			6 Months Ended	8 Months Ended	12 Months Ended
	Jul. 06, 2017 USD ($) ft²	Apr. 28, 2017 USD ($) unit	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Real Estate [Line Items]
Acquisition cost capitalized					$ 0.2
Pacific Ridge Apartments
Real Estate [Line Items]
Number of units in real estate property | unit		533
Purchase price consideration		$ 232.0
Acquisition cost capitalized				$ 0.1
Gateway Marketplace
Real Estate [Line Items]
Purchase price consideration	$ 42.0
Acquisition cost capitalized			$ 0.1
Area of real estate property | ft²	128,000