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Indebtedness - Additional Information (Detail) |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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Jan. 02, 2020 USD ($) | May 09, 2019 USD ($) | Oct. 30, 2018 USD ($) | Oct. 11, 2018 USD ($) | Jan. 03, 2018 USD ($) | Nov. 20, 2017 USD ($) | May 01, 2017 USD ($) | Feb. 28, 2019 USD ($) | Dec. 31, 2019 USD ($) Property | Dec. 31, 2018 USD ($) Property | Dec. 31, 2017 USD ($) | Nov. 30, 2019 USD ($) | Nov. 17, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 17, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | $ 572,000 |  |  |  |  |  | $ 572,000 |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  | $ 5,606,000 |  | $ 5,927,000 |  |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |  |  | $ 991,178,000 |  | $ 991,415,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Mortgages-Fixed Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Property Dispositions | Property |  |  |  |  |  |  |  |  | 3 |  | 2 |  |  |  |  |  |
Mortgage loan related to property disposition |  |  |  |  |  |  |  |  | $ 76,512,000 |  | $ 46,772,000 |  |  |  |  |  |
Mortgages-Fixed Rate | Waterford Landing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from credit facility | $ 62,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |  |  |  |  | 155,743,000 |  |  |  |  |  |
Unsecured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  | $ 300,000,000 |  | $ 350,000,000 |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  | 2,336,000 | [1] | 1,760,000 | [2] |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |  |  | 186,302,000 | [1] | 155,743,000 | [2] |  |  |  |  |
Unsecured Revolving Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, revolving line of credit |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  | May 09, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving line of credit, option to extend additional period |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity term description |  | option to extend the revolving commitment for two additional 6-month periods under certain circumstances, including the payment of an extension fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  | $ 1,129,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Revolving Line of Credit | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 1.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Revolving Line of Credit | Minimum | 1-month LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Revolving Line of Credit | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Revolving Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Revolving Line of Credit | Maximum | 1-month LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Revolving Line of Credit | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  | $ 100,000,000 |  |
Deferred financing costs |  |  |  |  |  | $ 917,000 |  |  |  |  |  |  |  | $ 257,000 |  |  |
Unsecured Term Loan | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  | 1.20% |  |  |  |  |  |  |  |  |  |  |
Unsecured Term Loan | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  |  |  |  | 1.90% |  |  |  |  |  |  |  |  |  |  |
Unsecured Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  | Jan. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  | 1,582,000 |  | 1,620,000 |  |  |  |  |  |
Proceeds from credit facility |  |  | $ 150,000,000 |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  | $ 821,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Principal |  |  |  |  |  |  |  |  | 300,000,000 |  | $ 250,000,000 |  |  |  |  |  |
Unsecured Term Loans | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 1.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Term Loans | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 1.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Term Loans | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate |  |  | 1.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Key Bank Senior Facility | Secured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 312,500,000 | $ 325,000,000
Key Bank Senior Facility | Unsecured Revolving Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pool of unencumbered properties occupancy level |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |
[1] | The unsecured credit facility total capacity is $350,000, of which $186,302 was outstanding as of December 31, 2019.
[2] | The secured credit facility total capacity was $300,000, of which $155,743 was outstanding as of December 31, 2018.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Description of the conditions for borrowing under the credit facility including the nature of any restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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