Commitments to Acquire/Dispose of Real Estate - Separate Agreement to Acquire (Details) - Subsequent Event [Member] $ in Thousands	Jul. 28, 2017 USD ($) Property ApartmentUnit
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	160
Purchase Price | $	$ 115,999
Rental Properties to be Acquired [Member]
Property/Unit schedule
Properties | Property	1
Apartment Units | ApartmentUnit	160
Purchase Price | $	$ 115,999