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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

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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