Notes Payable, Bank Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Additional Information (Detail)								12 Months Ended
	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