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Summary of Acquisitions (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) Property
Business Acquisition [Line Items]
Units | Property	1,843
Contract Price | $	$ 195,448
Creekside Corners | Lithonia, GA
Business Acquisition [Line Items]
Date of Purchase	Jan. 03, 2018	[1]
Units | Property	444	[1]
Contract Price | $	$ 43,901	[1]
Hartshire Lakes | Bargersville, IN
Business Acquisition [Line Items]
Date of Purchase	Jan. 03, 2018	[1]
Units | Property	272	[1]
Contract Price | $	$ 27,597	[1]
The Chelsea | Columbus, OH
Business Acquisition [Line Items]
Date of Purchase	Jan. 04, 2018
Units | Property	312
Contract Price | $	$ 36,750
Avalon Oaks | Columbus, OH
Business Acquisition [Line Items]
Date of Purchase	Feb. 27, 2018
Units | Property	235
Contract Price | $	$ 23,000
Bridgeview | Tampa, FL
Business Acquisition [Line Items]
Date of Purchase	Jul. 11, 2018
Units | Property	348
Contract Price | $	$ 43,000
Collier Park | Grove City, OH
Business Acquisition [Line Items]
Date of Purchase	Jul. 26, 2018
Units | Property	232
Contract Price | $	$ 21,200
[1] These properties were acquired as the last phase of our acquisition of a nine-community portfolio, totaling 2,352 units, which we agreed to acquire on September 3, 2017 for a total purchase price of $228,144.

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