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Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 30, 2018 | Oct. 11, 2018 | Jan. 03, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Principal |  |  |  | $ 968,738 | $ 784,640
Unsecured Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Principal |  |  |  | $ 100,000 | $ 100,000
Subsequent Event | Unsecured Term Loan | KeyBank |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | Jan. 31, 2024 |  |  |  |
Amount drew down from credit facility | $ 150,000 |  |  |  |
Weighted Average Maturity (in years) | 5 years |  |  |  |
Secured credit facility borrowing capacity | $ 200,000 |  |  |  |
Unsecured credit facility remaining available borrowing capacity | $ 50,000 |  |  |  |
Subsequent Event | Unsecured Term Loan | KeyBank | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt interest rate | 1.45% |  |  |  |
Hartshire Lakes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Principal |  |  | $ 16,000 |  |
Debt interest rate |  |  | 4.68% |  |
Interest payment period |  |  |  | monthly |
Debt Instrument amortization period |  |  | 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 |
Debt Instrument amortization period |  |  | 30 years |  |
Maturity date |  |  | Jan. 31, 2025 |  |
Outstanding Principal, fair value |  |  | $ 23,426 |  |
Waterford Landing |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest payment period |  |  |  | monthly |
Waterford Landing | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Principal |  | $ 15,500 |  |  |
Debt interest rate |  | 4.82% |  |  |
Debt Instrument amortization period |  | 30 years |  |  |
Maturity date |  | Jan. 31, 2026 |  |  |
Waterford Landing | Subsequent Event | Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount drew down from credit facility |  | $ 31,000 |  |  |

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