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Investments in Real Estate - Additional Information (Detail) $ in Thousands						3 Months Ended	12 Months Ended
	Feb. 27, 2017 USD ($) Property	Dec. 22, 2015 USD ($) Property	Oct. 15, 2015 USD ($)	Sep. 17, 2015 USD ($) Property	May 02, 2015 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) Property	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	May 01, 2015 Property
Real Estate Properties [Line Items]
Number of multifamily properties owned | Property							46
Investment in real estate held for sale							$ 60,786
Acquisition of real estate properties								$ 24,746	$ 299,881
Fair value of net assets acquired				$ 64,604			732	$ 64,604	$ 2,882
Gain (loss) on sale							31,785
Number of Multifamily Property Disposed | Property		1
Sale Price of Real Estate Property		$ 33,600					88,000
Gain (loss) on sale of assets		$ 6,420	$ 8
Parcel of land sold			$ 3,350
TSRE Properties
Real Estate Properties [Line Items]
Fair value of net assets acquired						$ 641	91
Multifamily Property
Real Estate Properties [Line Items]
Gain (loss) on sale							$ (9)
Trade Street Residential, Inc.
Real Estate Properties [Line Items]
Number of multifamily property acquired | Property				4,989
Number of properties acquired | Property				19
Net assets acquired				$ 328,240
Consideration transferred				263,636
Cash consideration for merger				139,781
Limited Partner | Trade Street Residential, Inc.
Real Estate Properties [Line Items]
Fair value of equity consideration transferred				13,998
Common Shares | Trade Street Residential, Inc.
Real Estate Properties [Line Items]
Fair value of equity consideration transferred				$ 109,857
Indianapolis Indiana
Real Estate Properties [Line Items]
Number of multifamily property acquired | Property										236
Acquisition of real estate properties					$ 25,250
Tampa , Florida | Subsequent Event
Real Estate Properties [Line Items]
Number of multifamily property acquired | Property	216
Acquisition of real estate properties	$ 29,750

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