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Mortgage Indebtedness - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 09, 2014 Secured revolving credit facility LIBOR | Sep. 30, 2014 Mortgages Debt | Dec. 31, 2013 Mortgages Debt | Jul. 15, 2014 Arbors at the Reservoir | Sep. 30, 2014 Arbors at the Reservoir | Jul. 15, 2014 Arbors at the Reservoir | Jul. 15, 2014 Carrington | Sep. 30, 2014 Carrington | Jul. 15, 2014 Carrington | May 27, 2014 Crossings | Sep. 30, 2014 Crossings | May 27, 2014 Crossings | Mar. 31, 2014 King's Landing | Sep. 30, 2014 King's Landing | Mar. 31, 2014 King's Landing | Feb. 28, 2014 OKC Portfolio | Sep. 30, 2014 OKC Portfolio | Feb. 28, 2014 OKC Portfolio | Feb. 07, 2014 Reserve at Eagle Ridge | Sep. 30, 2014 Reserve at Eagle Ridge | Feb. 07, 2014 Reserve at Eagle Ridge | Sep. 15, 2014 Walnut Hill | Sep. 30, 2014 Walnut Hill | Sep. 15, 2014 Walnut Hill | Oct. 24, 2014 Lenoxplace Subsequent event | Oct. 24, 2014 Lenoxplace Subsequent event | Sep. 30, 2014 Sponsor | Sep. 30, 2014 Sponsor | Dec. 31, 2013 Sponsor | Sep. 30, 2014 Third Parties | Dec. 31, 2013 Third Parties | Sep. 09, 2014 Before Amendment Secured revolving credit facility | Sep. 09, 2014 After Amendment Secured revolving credit facility
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Interest Rate |  |  |  |  | 3.70% | 3.80% |  | 4.00% |  |  | 4.00% |  |  | 3.90% |  | 4.00% | 4.00% | [1] |  | 5.60% | 2.80% | [2] |  |  | 4.70% |  |  | 3.40% |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,075 | $ 38,075 | $ 38,075 | $ 208,922 | $ 65,228 |  |
Interest paid | 6,022 | 2,641 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 244 | 723 |  |  |  |  |
Loan agreement amount | 253,833 |  | 103,303 |  |  |  |  |  | 13,150 |  |  | 14,235 |  |  | 15,313 |  |  |  |  |  |  |  |  |  |  | 18,850 |  |  | 18,650 |  | 15,991 |  |  |  |  |  |  |
Loan fixed interest rate |  |  |  |  |  |  |  |  | 4.00% |  |  | 4.00% |  |  | 3.90% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.40% |  | 3.70% |  |  |  |  |  |  |
Loan maturity date |  |  |  |  |  |  | Aug. 01, 2024 |  |  | Aug. 01, 2024 |  |  | Jun. 01, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 01, 2021 |  |  | Nov. 01, 2021 |  |  |  |  |  |  |  |
Revolving credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 | 30,000
Debt instrument basis spread on LIBOR |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans payable on real estate | 69,512 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,200 |  |  |  | 45,763 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity Date |  |  |  |  |  |  |  | Aug. 01, 2024 |  |  | Aug. 01, 2024 |  |  | Jun. 01, 2024 |  | Jun. 01, 2021 | Jun. 01, 2021 |  |  | Apr. 01, 2016 | Apr. 01, 2016 |  |  |  | Mar. 01, 2024 |  |  | Oct. 01, 2021 |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Monthly | Monthly |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2017 | Jun. 01, 2017 |  |  |  |  |  |  | Mar. 01, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization schedule |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years | 30 years |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Amount | 72,660 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,312 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,549 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Interest Rate | 3.70% |  | 3.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Fixed Rate. Interest only payments are due monthly. Beginning June 1, 2017, principal and interest payments are required based on a 30-year amortization schedule.
[2] | Contractual interest rate is 5.6%. The debt was assumed and recorded at a premium that will be amortized to interest expense over the remaining term. Principal and interest payments are required based on a 30-year amortization schedule.

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