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Indebtedness - Additional Information (Detail) - USD ($)
$ in Thousands

1 Months Ended

6 Months Ended

Jan. 03, 2018

Jul. 31, 2018

Jun. 30, 2018

Dec. 31, 2017

Debt Instrument [Line Items]

Outstanding Principal

$ 917,574

$ 784,640

Unsecured Credit Facility

Debt Instrument [Line Items]

Outstanding Principal

$ 199,005

^[1]

$ 104,005

^[2]

Hartshire Lakes

Debt Instrument [Line Items]

Outstanding Principal

$ 16,000

Debt interest rate

4.68%

Interest payment period

monthly

Weighted Average Maturity (in years)

30 years

Maturity date

Jan. 31, 2025

Outstanding Principal, fair value

$ 15,936

Creekside Corners

Debt Instrument [Line Items]

Outstanding Principal

$ 23,500

Debt interest rate

4.56%

Interest payment period

monthly

Weighted Average Maturity (in years)

30 years

Maturity date

Jan. 31, 2025

Outstanding Principal, fair value

$ 23,426

Bridgeview and Collier Park | Unsecured Credit Facility | Subsequent Event

Debt Instrument [Line Items]

Amount drew down from credit facility

$ 70,000

[1]	The unsecured credit facility total capacity is $300,000, of which $199,005 was outstanding as of June 30, 2018.
[2]	The unsecured credit facility total capacity was $300,000, of which $104,005 was outstanding as of December 31, 2017.

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