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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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