Notes Payable, Bank Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Additional Information (Detail)									12 Months Ended
	Sep. 06, 2022 USD ($)	Aug. 24, 2022 USD ($)	Aug. 04, 2022 USD ($)	Jun. 07, 2022 USD ($)	Mar. 11, 2022 USD ($)	Nov. 19, 2021 USD ($)	Jun. 11, 2021 USD ($)	Jan. 05, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Oct. 01, 2030	Oct. 01, 2027	Aug. 23, 2022 USD ($) swap	Feb. 23, 2022 USD ($)
Debt Instrument [Line Items]
Outstanding debt									$ 1,200,000,000
Fixed rate mortgages									961,577,000	$ 941,456,000
Variable rate debt									161,941,000	103,167,000
Long-term debt repayments of principal and balloon payments									1,238,683,000	1,200,000,000
Debt outstanding with fixed-rate										949,000,000
Debt outstanding with variable-rate										206,000,000
Term loan facility payable									99,382,000	99,233,000
Number of interest rate swaps | swap														2
Repayments of secured debt									174,096,000	42,641,000	$ 45,654,000
Loss on early extinguishment of debt									648,000	0	0
Remaining loan balance									320,797,000
Payment for debt extinguishment or debt prepayment cost									593,000	0	0
Unamortized deferred debt costs									15,783,000	11,200,000
Accumulated amortization									7,900,000	7,700,000
Capitalization of debt issuance cost									9,900,000	6,400,000	$ 1,200,000
Interest rate swaps
Debt Instrument [Line Items]
Derivative asset									$ 4,000,000
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate spread on LIBOR									0.10%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate spread on LIBOR									1.40%
Term Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Interest rate spread on LIBOR									1.35%
Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Available borrowing capacity									$ 212,100,000
Term loan facility payable									264,000,000
Letter of Credit
Debt Instrument [Line Items]
Term loan facility payable									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 | Jamestown Place
Debt Instrument [Line Items]
Payment for debt extinguishment or debt prepayment cost								$ 6,100,000
Mortgages | Hunt Club Corners
Debt Instrument [Line Items]
Payment for debt extinguishment or debt prepayment cost							$ 5,000,000
Mortgage Notes Payable
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure									2,000,000	41,000,000
Fixed rate mortgage notes payable
Debt Instrument [Line Items]
Fixed rate mortgages									1,070,000,000.00	949,000,000
Variable rate loans payable
Debt Instrument [Line Items]
Variable rate debt									$ 164,000,000
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%
Construction-to-Permanent Loan | Secured Debt
Debt Instrument [Line Items]
Loan amount															$ 133,000,000
Loan fixed interest rate															3.90%
Amortization schedule									25 years
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]
Loan amount			$ 25,300,000
Loan fixed interest rate			4.14%
Amortization schedule			25 years
Long-term debt, term			15 years
Loan required periodic principal and interest payment			$ 135,200
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]
Loan amount		$ 31,500,000
Loan fixed interest rate		3.91%
Amortization schedule		25 years
Long-term debt, term		7 years
Loan required periodic principal and interest payment		$ 164,700
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]
Loan amount	$ 143,000,000
Loan fixed interest rate	5.05%
Amortization schedule	25 years
Long-term debt, term	15 years
Loan required periodic principal and interest payment	$ 840,100
Debt instrument, payment at maturity	79,900,000
Repayments of debt	85,300,000
Debt instrument, prepayment penalty	$ 5,900,000
Broadlands Village
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure									$ 3,600,000
Remaining loan balance									28,900,000
Avenel Business Park
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure									6,300,000
Remaining loan balance									22,900,000
Waycroft Construction Loan
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure									23,600,000
Remaining loan balance									152,700,000
Ashbrook Marketplace
Debt Instrument [Line Items]
Remaining loan balance									20,800,000
Kentlands Square I
Debt Instrument [Line Items]
Remaining loan balance									28,200,000
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%
Debt Covenant
Debt Instrument [Line Items]
Notes payable to bank									$ 1,000,000,000	$ 1,100,000,000
Credit agreement leverage ratio									60.00%
Interest coverage ratio required minimum									2.0
Required fixed charge coverage ratio									1.4