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Notes Payable, Bank Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Additional Information (Detail) |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |
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Mar. 08, 2023 USD ($) | Sep. 06, 2022 USD ($) | Aug. 24, 2022 USD ($) | Aug. 04, 2022 USD ($) | Jun. 07, 2022 USD ($) | Mar. 11, 2022 USD ($) | Nov. 19, 2021 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 01, 2030 | Oct. 01, 2027 | Aug. 23, 2022 USD ($) swap | Feb. 23, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt |  |  |  |  |  |  |  | $ 1,400,000,000 |  |  |  |  |  |
Fixed rate mortgages |  |  |  |  |  |  |  | 935,451,000 | $ 961,577,000 |  |  |  |  |
Variable rate debt |  |  |  |  |  |  |  | 274,715,000 | 161,941,000 |  |  |  |  |
Long-term debt repayments of principal and balloon payments |  |  |  |  |  |  |  | 1,406,285,000 | 1,200,000,000 |  |  |  |  |
Debt outstanding with fixed-rate |  |  |  |  |  |  |  |  | 1,070,000,000.00 |  |  |  |  |
Debt outstanding with variable-rate |  |  |  |  |  |  |  |  | 164,000,000 |  |  |  |  |
Term loan facility payable, net |  |  |  |  |  |  |  | 99,530,000 | 99,382,000 |  |  |  |  |
Number of interest rate swaps | swap |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Construction loans payable, net |  |  |  |  |  |  |  | 77,305,000 | 0 |  |  |  |  |
Repayments of secured debt |  |  |  |  |  |  |  | 42,332,000 | 174,096,000 | $ 42,641,000 |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  | 0 | 648,000 | 0 |  |  |  |
Remaining loan balance |  |  |  |  |  |  |  | 332,333,000 |  |  |  |  |  |
Unamortized deferred debt costs |  |  |  |  |  |  |  | 19,284,000 | 15,800,000 |  |  |  |  |
Accumulated amortization |  |  |  |  |  |  |  | 10,600,000 | 7,900,000 |  |  |  |  |
Capitalization of debt issuance cost |  |  |  |  |  |  |  | 400,000 | 9,900,000 | $ 6,400,000 |  |  |  |
Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset |  |  |  |  |  |  |  | $ 2,700,000 | 4,000,000 |  |  |  |  |
Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  | 1.40% |  |  |  |  |  |
Term Facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  | 1.35% |  |  |  |  |  |
Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  |  |  |  |  |  | $ 137,900,000 |  |  |  |  |  |
Term loan facility payable, net |  |  |  |  |  |  |  | 376,000,000 |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan facility payable, net |  |  |  |  |  |  |  | 185,000 |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | 525,000,000 |  |  |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | 425,000,000 |  |  |  |  |  |
Line of Credit | Term Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 9,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |
Fixed rate mortgage notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate mortgages |  |  |  |  |  |  |  | 1,130,000,000 | 1,070,000,000.00 |  |  |  |  |
Variable rate loans payable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate debt |  |  |  |  |  |  |  | 276,000,000 |  |  |  |  |  |
Term Loan | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |
Term Loan | Secured Debt | Agreement Ending October 1, 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |
Term Loan | Secured Debt | Agreement Ending October 1, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |
Term Loan | Secured Debt | Secured Overnight Financing Rate (SOFR) | Agreement Ending October 1, 2030 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  |  |  |  |  | 2.91% |  |  |
Term Loan | Secured Debt | Secured Overnight Financing Rate (SOFR) | Agreement Ending October 1, 2027 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  |  |  |  |  |  | 2.96% |  |
BJ’s Wholesale Club | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, term | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Loan amount | $ 15,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Loan fixed interest rate | 6.07% |  |  |  |  |  |  |  |  |  |  |  |  |
Loan required periodic principal and interest payment | $ 99,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization schedule | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, payment at maturity | $ 11,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Twinbrook Quarter |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  |  |  | $ 74,900,000 |  |  |  |  |  |
Guarantor obligations, liquidation proceeds, percentage |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Twinbrook Quarter | 3.80% Fixed Rate Loan Maturing In 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  |  |  | $ 145,000,000 |  |  |  |  |  |  |
Amortization schedule |  |  |  |  |  |  | 25 years |  |  |  |  |  |  |
Twinbrook Quarter | 3.83% Fixed Rate Loan Maturing In 2041 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan fixed interest rate |  |  |  |  |  |  | 3.83% |  |  |  |  |  |  |
Construction-to-Permanent Loan | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  |  |  |  |  | $ 4,900,000 |  |  |  |  |  | $ 133,000,000
Loan fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.90%
Amortization schedule |  |  |  |  |  |  |  | 25 years |  |  |  |  |  |
Construction-to-Permanent Loan | Construction Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction loans payable, net |  |  |  |  |  |  |  | $ 72,400,000 |  |  |  |  |  |
Lansdowne Town Center Mortgage | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  |  | $ 28,300,000 |  |  |  |  |  |  |  |
Orchard Park Mortgage | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  | $ 8,600,000 |  |  |  |  |  |  |  |  |
Village Center Loan | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, term |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |
Loan amount |  |  |  | $ 25,300,000 |  |  |  |  |  |  |  |  |  |
Loan fixed interest rate |  |  |  | 4.14% |  |  |  |  |  |  |  |  |  |
Loan required periodic principal and interest payment |  |  |  | $ 135,200 |  |  |  |  |  |  |  |  |  |
Amortization schedule |  |  |  | 25 years |  |  |  |  |  |  |  |  |  |
Debt instrument, payment at maturity |  |  |  | $ 13,400,000 |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | 11,200,000 |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Great Falls Center Loan | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, term |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |
Loan amount |  |  | $ 31,500,000 |  |  |  |  |  |  |  |  |  |  |
Loan fixed interest rate |  |  | 3.91% |  |  |  |  |  |  |  |  |  |  |
Loan required periodic principal and interest payment |  |  | $ 164,700 |  |  |  |  |  |  |  |  |  |  |
Amortization schedule |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |
Debt instrument, payment at maturity |  |  | $ 25,700,000 |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |
Beacon Center and Seven Corners Loan | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, term |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |
Loan amount |  | $ 143,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Loan fixed interest rate |  | 5.05% |  |  |  |  |  |  |  |  |  |  |  |
Loan required periodic principal and interest payment |  | $ 840,100 |  |  |  |  |  |  |  |  |  |  |  |
Amortization schedule |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, payment at maturity |  | $ 79,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 85,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, prepayment penalty |  | $ 5,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Avenel Business Park |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  |  |  | 6,300,000 |  |  |  |  |  |
Remaining loan balance |  |  |  |  |  |  |  | 21,600,000 |  |  |  |  |  |
Waycroft Construction Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  |  |  | 23,600,000 |  |  |  |  |  |
Remaining loan balance |  |  |  |  |  |  |  | 149,100,000 |  |  |  |  |  |
Ashbrook Marketplace |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining loan balance |  |  |  |  |  |  |  | 20,200,000 |  |  |  |  |  |
Kentlands Square I |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining loan balance |  |  |  |  |  |  |  | 27,300,000 |  |  |  |  |  |
Hampden House |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  |  |  | $ 7,700,000 |  |  |  |  |  |
Guarantor obligations, liquidation proceeds, percentage |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Guarantor obligations, current carrying value |  |  |  |  |  |  |  | $ 26,600,000 |  |  |  |  |  |
Debt Covenant |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to bank |  |  |  |  |  |  |  | $ 1,500,000,000 | $ 1,000,000,000 |  |  |  |  |
Credit agreement leverage ratio |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |
Interest coverage ratio required minimum |  |  |  |  |  |  |  | 2.0 |  |  |  |  |  |
Required fixed charge coverage ratio |  |  |  |  |  |  |  | 1.4 |  |  |  |  |  |

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- Definition Credit Agreement Leverage Ratio + References No definition available. + Details
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- Definition Debt Instrument, Payment At Maturity + References No definition available. + Details
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- Definition Debt Instrument, Prepayment Penalty + References No definition available. + Details
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- Definition Long-term Debt, Repayments of Principal and Balloon Payments + References No definition available. + Details
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- Definition Amount of accumulated amortization of debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-3 + Details
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- Definition This element represents the carrying value of a short-term real estate loan to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project, usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. Note that there are separate concepts for the current and noncurrent portions of long-term construction loans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482900/835-30-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-2 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482949/835-30-55-8 + Details
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