Business Acquisition Percentage of Voting Interests Acquired Option To Purchase Additional Interests

No definition available.

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- Definition

Debt Instrument, Basis Spread on Variable Rate, Debt Yield

+ References

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- Definition

Line Of Credit Facility, Accordion Feature, Maximum Borrowing Capacity

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- Definition

Line Of Credit Facility, Duration Of Extension Option

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No definition available.

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- Definition

Line Of Credit Facility, Extension Fee Percentage

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No definition available.

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- Definition

Line Of Credit Facility, Number Of Extension Options

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No definition available.

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- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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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.

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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.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The effective interest rate at the end of the reporting period.

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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.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

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- Definition

Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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- Definition

Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates.

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No definition available.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Balance Type:	credit
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- Definition

The cash inflow from borrowings to finance the cost of construction.

+ References

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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.

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Indebtedness - Additional Information (Details)																									12 Months Ended
Indebtedness - Additional Information (Details)	Dec. 27, 2019 USD ($)	Dec. 12, 2019 USD ($)	Oct. 29, 2019 USD ($)	Oct. 03, 2019 USD ($) extension	Aug. 15, 2019 USD ($)	Jun. 26, 2019 USD ($)	May 23, 2019 USD ($)	Apr. 24, 2019 USD ($)	Mar. 14, 2019 USD ($)	Mar. 11, 2019 USD ($)	Oct. 12, 2018 USD ($)	Jul. 27, 2018 USD ($)	Jul. 12, 2018 USD ($)	Jun. 29, 2018 USD ($)	Jun. 14, 2018 USD ($)	Jun. 01, 2018 USD ($)	May 31, 2018 USD ($)	Mar. 27, 2018 USD ($)	Jan. 22, 2018	Oct. 13, 2017 USD ($)	Aug. 10, 2017 USD ($)	Jul. 13, 2017 USD ($)	Apr. 07, 2017 USD ($)	Feb. 01, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Feb. 20, 2020 USD ($)	Aug. 28, 2018 USD ($)	Dec. 28, 2017 USD ($)	Nov. 01, 2017 USD ($)	Sep. 01, 2017	Aug. 31, 2017	Aug. 09, 2017	Jun. 29, 2017 USD ($)	Feb. 24, 2017 USD ($)
Debt Instrument [Line Items]
Total principal balances																									$ 960,819,000	$ 700,722,000
Debt repayments																									270,851,000	173,855,000	$ 160,661,000
Sandbridge Commons
Debt Instrument [Line Items]
Repayment of debt																					$ 700,000
Columbus Village
Debt Instrument [Line Items]
Repayment of debt																		$ 8,300,000
Southgate Square
Debt Instrument [Line Items]
Debt, face value																	$ 22,000,000.0
River City
Debt Instrument [Line Items]
Repayment of debt																										10,500,000
249 Central Park Retail, Fountain Plaza Retail, And South Retail
Debt Instrument [Line Items]
Debt, face value															$ 35,000,000.0
Johns Hopkins Village
Debt Instrument [Line Items]
Debt, face value												$ 53,000,000.0
Effective interest rate												4.19%
Lightfoot Marketplace
Debt Instrument [Line Items]
Total principal balances																															$ 10,500,000
Harrisonburg Regal
Debt Instrument [Line Items]
Repayment of debt																							$ 3,200,000
Hanbury Village
Debt Instrument [Line Items]
Stated interest rate																																		3.78%
The Cosmopolitan
Debt Instrument [Line Items]
Stated interest rate																																3.35%	3.75%
Liberty Apartments
Debt Instrument [Line Items]
Repayment of debt																				$ 5,000,000.0
LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate		3.17%
LIBOR \| Thames Street Wharf
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate						1.30%
LIBOR \| Southgate Square
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate			1.55%
LIBOR \| Sandbridge Commons
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																			1.75%
LIBOR \| Southgate Square
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																	1.60%
LIBOR \| River City
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																1.50%
LIBOR \| 249 Central Park Retail, Fountain Plaza Retail, And South Retail
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate															1.60%
LIBOR \| Johns Hopkins Village
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate												1.25%
LIBOR \| Durham City Center
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate									1.85%
LIBOR \| 1405 Point
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate								2.25%
Note 5 \| North Point Center
Debt Instrument [Line Items]
Repayment of debt																								$ 600,000
Unsecured Debt
Debt Instrument [Line Items]
Total principal balances																									315,000,000	306,000,000
Construction Loans
Debt Instrument [Line Items]
Borrowings under construction loans																									96,300,000	86,900,000	$ 8,900,000
Secured Debt
Debt Instrument [Line Items]
Aggregate capacity under the credit facility		$ 34,000,000.0
Proceeds from lines of credit		$ 5,100,000
Total principal balances																									645,819,000	394,722,000
Secured Debt \| Thames Street Wharf
Debt Instrument [Line Items]
Aggregate capacity under the credit facility						$ 70,000,000.0
Total principal balances																									70,000,000	0
Secured Debt \| Southgate Square
Debt Instrument [Line Items]
Aggregate capacity under the credit facility			$ 25,000,000.0
Proceeds from lines of credit			$ 2,700,000
Secured Debt \| Sandbridge Commons
Debt Instrument [Line Items]
Total principal balances																									8,020,000	8,258,000
Secured Debt \| Southgate Square
Debt Instrument [Line Items]
Total principal balances																									20,562,000	21,442,000
Secured Debt \| Market at Mill Creek
Debt Instrument [Line Items]
Total principal balances																									14,727,000	7,283,000
Secured Debt \| Johns Hopkins Village
Debt Instrument [Line Items]
Total principal balances																									$ 51,800,000	52,708,000
Secured Debt \| Lexington Square
Debt Instrument [Line Items]
Debt, face value																													$ 15,000,000.0
Stated interest rate																									4.50%				4.50%
Total principal balances																									$ 14,696,000	14,940,000
Secured Debt \| Greenside (Harding Place)
Debt Instrument [Line Items]
Stated interest rate																									3.17%
Total principal balances																									$ 34,000,000	25,902,000
Secured Debt \| Hanbury Village
Debt Instrument [Line Items]
Stated interest rate																									3.78%
Total principal balances																									$ 18,515,000	19,019,000
Secured Debt \| The Cosmopolitan
Debt Instrument [Line Items]
Stated interest rate																									3.35%
Total principal balances																									$ 43,702,000	44,468,000
Secured Debt \| Liberty Apartments
Debt Instrument [Line Items]
Stated interest rate																									5.66%
Total principal balances																									$ 14,165,000	14,437,000
Secured Debt \| Durham City Center
Debt Instrument [Line Items]
Aggregate capacity under the credit facility									$ 25,600,000
Accordion feature maximum borrowing capacity									$ 27,600,000
Secured Debt \| 1405 Point
Debt Instrument [Line Items]
Total principal balances																									$ 53,000,000	0
Secured Debt \| LIBOR \| Thames Street Wharf
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																									1.30%
Secured Debt \| LIBOR \| Sandbridge Commons
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																									1.75%
Secured Debt \| LIBOR \| Southgate Square
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																									1.60%
Secured Debt \| LIBOR \| Market at Mill Creek
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																									1.55%
Secured Debt \| LIBOR \| Johns Hopkins Village
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																									1.25%
Secured Debt \| LIBOR \| 1405 Point
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																									2.25%
Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate on credit facility as of end of period (as a percent)																									3.26%
Revolving Credit Facility \| LIBOR \| Thames Street Wharf
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate						2.25%
Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Unused commitment fee																									1500.00%
Revolving Credit Facility \| Minimum \| LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																									1.30%
Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Unused commitment fee																									2500.00%
Revolving Credit Facility \| Maximum \| LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																									1.85%
Revolving Credit Facility \| Unsecured Debt
Debt Instrument [Line Items]
Total principal balances																									$ 110,000,000	$ 126,000,000
Revolving Credit Facility \| Secured Debt \| Thames Street Wharf
Debt Instrument [Line Items]
Aggregate capacity under the credit facility						$ 76,000,000.0
Senior Unsecured Term Loan Facility
Debt Instrument [Line Items]
Interest rate on credit facility as of end of period (as a percent)																									3.21%
Senior Unsecured Term Loan Facility \| Minimum \| LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																									1.25%
Senior Unsecured Term Loan Facility \| Maximum \| LIBOR
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate																									1.80%
Line of Credit \| Construction Loans \| River City
Debt Instrument [Line Items]
Aggregate capacity under the credit facility																$ 16,300,000
Line of Credit \| Construction Loans \| Brooks Crossing
Debt Instrument [Line Items]
Aggregate capacity under the credit facility														$ 15,600,000
Line of Credit \| Construction Loans \| Market at Mill Creek
Debt Instrument [Line Items]
Aggregate capacity under the credit facility													$ 16,200,000
Line of Credit \| Construction Loans \| Greenside (Harding Place)
Debt Instrument [Line Items]
Aggregate capacity under the credit facility																																				$ 29,800,000
Line of Credit \| Construction Loans \| 595 King Street And 530 Meeting Street
Debt Instrument [Line Items]
Aggregate capacity under the credit facility																														$ 66,500,000
Line of Credit \| Construction Loans \| LIBOR \| Brooks Crossing
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate														1.60%
Line of Credit \| Construction Loans \| LIBOR \| Market at Mill Creek
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate													1.55%
Line of Credit \| Secured Debt \| Lightfoot Marketplace
Debt Instrument [Line Items]
Repayment of debt					$ 17,900,000
Proceeds from lines of credit										$ 7,400,000	$ 10,500,000
Line of Credit \| Secured Debt \| Initial Tranche \| Lightfoot Marketplace
Debt Instrument [Line Items]
Effective interest rate											4.77%
Line of Credit \| Secured Debt \| Initial Tranche \| LIBOR \| Lightfoot Marketplace
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate											1.75%
Operating Partnership \| New Credit Facility
Debt Instrument [Line Items]
Aggregate capacity under the credit facility				$ 355,000,000.0
Operating Partnership \| Revolving Credit Facility
Debt Instrument [Line Items]
Aggregate capacity under the credit facility				150,000,000.0
Operating Partnership \| Revolving Credit Facility \| New Credit Facility
Debt Instrument [Line Items]
Aggregate capacity under the credit facility				150,000,000.0
Accordion feature maximum borrowing capacity				$ 700,000,000.0
Number of extension options \| extension				2
Duration of extension option				6 months
Extension fee percentage				0.075%
Operating Partnership \| Senior Unsecured Term Loan Facility
Debt Instrument [Line Items]
Aggregate capacity under the credit facility				$ 205,000,000.0
Operating Partnership \| Senior Unsecured Term Loan Facility \| New Credit Facility
Debt Instrument [Line Items]
Aggregate capacity under the credit facility				$ 205,000,000.0
Virginia Beach, Virginia \| Line of Credit \| Construction Loans \| Town Center Phase VI
Debt Instrument [Line Items]
Aggregate capacity under the credit facility																																			$ 27,900,000
Chesapeake, Virginia \| Commonwealth Of Virginia
Debt Instrument [Line Items]
Repayment of debt																						$ 4,900,000
Subsequent Event \| Revolving Credit Facility \| Unsecured Debt
Debt Instrument [Line Items]
Total principal balances																												$ 130,000,000.0
Red Mill Commons \| Operating Partnership
Debt Instrument [Line Items]
Acquisition, assumption of debt							$ 24,900,000
First Purchase Option \| 1405 Point
Debt Instrument [Line Items]
Option to acquire additional interest								79.00%
Acquisition, cash consideration								$ 300,000
1405 Point
Debt Instrument [Line Items]
Option to acquire additional interest								79.00%
Acquisition, cash consideration								$ 300,000
Loans payable	$ 53,000,000.0							64,900,000
Debt repayments	$ 12,300,000
Loans payable, fair value disclosure								$ 65,800,000
Marketplace at Hilltop
Debt Instrument [Line Items]
Acquisition, assumption of debt							$ 10,740,000
Stated interest rate							4.42%
Loans payable, fair value disclosure							$ 10,790,000
Marketplace at Hilltop \| Operating Partnership
Debt Instrument [Line Items]
Acquisition, assumption of debt							$ 10,800,000
Yield One \| 1405 Point
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate, debt yield								8.50%
Yield One \| LIBOR \| 1405 Point
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate								2.00%
Yield Two \| 1405 Point
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate, debt yield								9.50%
Yield Two \| LIBOR \| 1405 Point
Debt Instrument [Line Items]
Stated interest rate, basis spread on variable rate								1.75%