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Investments in Real Estate - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified			0 Months Ended		0 Months Ended			0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended		0 Months Ended			0 Months Ended
	Sep. 30, 2014 Property	Dec. 31, 2013 Property	Jun. 04, 2014 Arbors at the Reservoir	Jun. 04, 2014 Arbors at the Reservoir Property	May 07, 2014 Carrington	May 07, 2014 Carrington Property	May 07, 2014 Carrington Noncontrolling Interest	Mar. 31, 2014 King's Landing	Mar. 31, 2014 King's Landing Property	Feb. 28, 2014 OKC Portfolio	Feb. 28, 2014 OKC Portfolio Property	Jan. 31, 2014 Reserve at Eagle Ridge	Jan. 31, 2014 Reserve at Eagle Ridge Property	Sep. 15, 2014 Stonebridge Crossing	Sep. 15, 2014 Stonebridge Crossing Property	Sep. 05, 2014 Lenoxplace	Sep. 05, 2014 Lenoxplace Property	Aug. 28, 2014 Walnut Hill	Aug. 28, 2014 Walnut Hill Property	Aug. 28, 2014 Walnut Hill Noncontrolling Interest	Oct. 20, 2014 Louisville Subsequent event Agreement Property	Oct. 20, 2014 Louisville Subsequent event Property
Real Estate Properties [Line Items]
Number of multifamily property owned	22	10									5
Number of units located with multifamily properties	6,470	2,790		170		202			152		1,658		370		500		268		360			1,549
Number of purchase and sales agreements																					5
Purchased price of a property			$ 20,250		$ 21,500			$ 32,700		$ 65,000		$ 29,000		$ 29,800		$ 24,250		$ 27,900			$ 162,500
Number of limited units issued							222,062													137,361
Limited units issued value							1,986													1,377
Loans payable on real estate	69,512								21,200		45,763
Loan payable interest rate								4.00%		5.60%
Loan payable maturity date								Jun. 01, 2021		Apr. 01, 2016
Fair value of properties acquired	252,095										70,431
Fair value of debt assumed	72,660										48,312
Gain (loss) on assets										$ 2,882

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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The amount of the limited partners' ownership interests.

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Stated maturity date of the mortgage loan receivable on real estate, in CCYY-MM-DD format.

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The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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