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Notes Payable, Bank Credit Facility, Interest and Amortization of Deferred Debt Costs - Narrative (Details) |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
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Sep. 06, 2022 USD ($) | Aug. 24, 2022 USD ($) | Aug. 04, 2022 USD ($) | Jun. 07, 2022 USD ($) | Mar. 11, 2022 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Oct. 01, 2030 | Oct. 01, 2027 | Aug. 23, 2022 USD ($) swap | Feb. 23, 2022 USD ($) | Dec. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility payable, net |  |  |  |  |  | $ 125,747,000 |  | $ 125,747,000 |  |  |  |  |  | $ 103,167,000
Number of interest rate swaps | swap |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Repayments of secured debt |  |  |  |  |  |  |  | 166,290,000 | $ 33,670,000 |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  | 648,000 | $ 0 | 648,000 | $ 0 |  |  |  |  |
Long-term debt |  |  |  |  |  | 1,194,200,000 |  | 1,194,200,000 |  |  |  |  |  |
Principal amount |  |  |  |  |  | 1,210,488,000 |  | 1,210,488,000 |  |  |  |  |  | 1,200,000,000
Debt outstanding with fixed-rate |  |  |  |  |  | 1,100,000,000 |  | 1,100,000,000 |  |  |  |  |  | 949,000,000
Debt outstanding with variable-rate |  |  |  |  |  | 128,000,000 |  | 128,000,000 |  |  |  |  |  | 206,000,000
Carrying value of properties collateralizing mortgage notes |  |  |  |  |  | 1,000,000,000 |  | 1,000,000,000 |  |  |  |  |  | 1,100,000,000
Unamortized deferred debt costs |  |  |  |  |  | 16,288,000 |  | 16,288,000 |  |  |  |  |  | 11,200,000
Debt issuance costs amortization |  |  |  |  |  | 7,400,000 |  | 7,400,000 |  |  |  |  |  | $ 7,700,000
Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset |  |  |  |  |  | 4,300,000 |  | 4,300,000 |  |  |  |  |  |
Broadlands Village Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  | 3,700,000 |  | 3,700,000 |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 29,100,000 |  | 29,100,000 |  |  |  |  |  |
Avenel Business Park |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  | 6,300,000 |  | 6,300,000 |  |  |  |  |  |
The Waycroft Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, maximum exposure |  |  |  |  |  | 23,600,000 |  | $ 23,600,000 |  |  |  |  |  |
Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |
Revolving Credit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  | 1.40% |  |  |  |  |  |
Term Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on LIBOR |  |  |  |  |  |  |  | 1.35% |  |  |  |  |  |
Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  |  | 248,800,000 |  | $ 248,800,000 |  |  |  |  |  |
Revolving credit facility payable, net |  |  |  |  |  | 228,000,000 |  | 228,000,000 |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility payable, net |  |  |  |  |  | 185,000 |  | 185,000 |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | 525,000,000 |  | 525,000,000 |  |  |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | 425,000,000 |  | 425,000,000 |  |  |  |  |  |
Line of Credit | Term Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | 100,000,000 |  | 100,000,000 |  |  |  |  |  |
Line of Credit | Unsecured Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility payable, net |  |  |  |  |  | 128,000,000 |  | $ 128,000,000 |  |  |  |  |  |
Secured Debt | Construction-to-Permanent Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  |  |  | 3.90% |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 133,000,000 |
Amortization period |  |  |  |  |  |  |  | 25 years |  |  |  |  |  |
Secured Debt | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |
Secured Debt | Term Loan | Agreement Ending October 1, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |
Secured Debt | Term Loan | Agreement Ending October 1, 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
Secured Debt | Secured Overnight Financing Rate (SOFR) | Term Loan | Forecast | Agreement Ending October 1, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  |  |  |  |  | 2.96% |  |  |
Secured Debt | Secured Overnight Financing Rate (SOFR) | Term Loan | Forecast | Agreement Ending October 1, 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  |  |  |  | 2.91% |  |  |  |
Mortgages | Lansdowne Town Center Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  | $ 28,300,000 |  |  |  |  |  |  |  |  |
Mortgages | Orchard Park Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  | $ 8,600,000 |  |  |  |  |  |  |  |  |  |
Mortgages | Village Center Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 4.14% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 25,300,000 |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |
Long-term debt, term |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |
Debt instrument, periodic 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 |  |  |  |  |  |  |  |  |  |  |
Mortgages | Great Falls Center Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  | 3.91% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 31,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Amortization period |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, term |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, periodic 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 |  |  |  |  |  |  |  |  |  |  |  |
Mortgages | Beacon Center and Seven Corners Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 5.05% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 143,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, term | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, periodic payment | $ 840,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, payment at maturity | 79,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | 85,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, prepayment penalty | $ (5,900,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgages | Avenel Business Park |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 23,200,000 |  | $ 23,200,000 |  |  |  |  |  |
Mortgages | The Waycroft Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 153,600,000 |  | 153,600,000 |  |  |  |  |  |
Mortgages | Ashbrook Marketplace Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | 21,000,000 |  | 21,000,000 |  |  |  |  |  |
Mortgages | Kentlands Place Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 28,400,000 |  | $ 28,400,000 |  |  |  |  |  |

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