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Indebtedness - Additional Information (Detail) |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
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Oct. 30, 2018 USD ($) | Oct. 11, 2018 USD ($) | Jan. 03, 2018 USD ($) | Dec. 12, 2017 USD ($) | Nov. 20, 2017 USD ($) | May 01, 2017 USD ($) | Jun. 24, 2016 USD ($) | May 26, 2016 USD ($) | May 20, 2016 USD ($) | May 17, 2016 USD ($) | Feb. 22, 2019 USD ($) | Jan. 31, 2019 USD ($) | Mar. 31, 2016 USD ($) | Feb. 29, 2016 USD ($) | Dec. 31, 2018 USD ($) Property | Dec. 31, 2017 USD ($) Property | Dec. 31, 2016 USD ($) | Nov. 17, 2017 USD ($) | Dec. 21, 2016 USD ($) | Sep. 17, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ 572,000 |  |  |  |  |  |  |  |  |  |  | $ 572,000 |  | $ 1,210,000 |  |  |
Outstanding Principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 991,415,000 |  | $ 784,640,000 |  |  |  |  |
Mortgages-Fixed Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument repayment |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,694,000 |  |  |  |  |  |  |  |  |
Number of property dispositions | Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 4 |  |  |  |  |
Mortgage loan related to property disposition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46,772,000 |  | $ 35,901,000 |  |  |  |  |
Repayment of term loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,659,000 |  |  |  |  |  |  |  |
Mortgages-Fixed Rate | Brunswick Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  | May 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal |  |  |  | $ 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  | 4.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Monthly |  |  |  |  |
Outstanding Principal, fair value |  |  |  | $ 18,977,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgages-Fixed Rate | Aston |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  | Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |  | $ 25,050,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  | 3.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Monthly |  |  |
Principal date |  |  |  |  |  |  |  | Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgages-Fixed Rate | Craig Ranch |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  | Jun. 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |  |  |  | $ 31,250,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  |  | 3.30% |  |  |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Monthly |  |  |
Principal date |  |  |  |  |  |  |  |  |  | May 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Mortgages-Fixed Rate | Big Creek |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  | Jun. 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |  |  | $ 49,680,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  |  |  |  | 3.70% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Monthly |  |  |  |  |  |  |
Principal date |  |  |  |  |  |  |  |  | Jun. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Hartshire Lakes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  | Jan. 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal |  |  | $ 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 4.68% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | monthly |  |  |  |  |  |  |
Debt Instrument amortization period |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal, fair value |  |  | $ 15,936,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Creekside Corners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  | Jan. 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal |  |  | $ 23,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 4.56% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | monthly |  |  |  |  |  |  |
Debt Instrument amortization period |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal, fair value |  |  | $ 23,426,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Waterford Landing | Mortgages-Fixed Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  | Jan. 31, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal |  | $ 15,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 4.82% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | monthly |  |  |  |  |  |  |
Debt Instrument amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |  |
Outstanding Principal, fair value |  | $ 15,394,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 104,005,000 |  |  |  |  |
Revolving Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | May 01, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date, option to extend the period |  |  |  |  |  | extend the revolving commitment for two additional 6-month periods |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | May 01, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 155,743,000 | [1] | 104,005,000 | [2] |  |  |  |
Unsecured Credit Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drew down from credit facility |  |  |  |  |  |  |  |  |  |  |  | $ 14,000,000 |  |  |  |  |  |  |  |  |  |
Unsecured Credit Facility | If greater than or equal to 50% of the revolver is used |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fee on line of credit facility outstanding |  |  |  |  |  | 0.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Credit Facility | If less than 50% of the revolver is used |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fee on line of credit facility outstanding |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to increase the credit facility |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Credit Facility | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  | 2.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  | 1.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Credit Facility | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  | 1.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |
Deferred financing costs |  |  |  |  | $ 917,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Term Loan | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Term Loan | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  | 1.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  | 100,000,000 |  |  |  |  |
Key Bank Senior Facility | Secured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 325,000,000
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,722,000
Pool of unencumbered properties occupancy level |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |
Key Bank Senior Facility | Revolving Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 312,500,000 |  |  |  | $ 172,500,000 | 125,000,000
Key Bank Senior Facility | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000
Key Bank Interim Facility | Senior Interim Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,000,000
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,092,000
Key Bank Interim Facility | Senior Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  | Sep. 17, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from credit facility |  |  |  |  |  |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument closing costs |  |  |  |  |  |  | 416,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument repayment |  |  |  |  |  |  | $ 33,512,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
KeyBank | Unsecured Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs | 821,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from credit facility | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date | Jan. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
KeyBank | Unsecured Term Loan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from credit facility |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |
KeyBank | Unsecured Term Loan | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate | 1.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The unsecured credit facility total capacity is $300,000, of which $155,743 was outstanding as of December 31, 2018.
[2] | The secured credit facility total capacity was $300,000, of which $104,005 was outstanding as of December 31, 2017.

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