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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 |
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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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