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Unsecured and Secured Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |
Covenant terms |  | The fixed-rate senior notes were issued pursuant to indentures that contain certain covenants, including limitations on incurrence of debt, maintenance of unencumbered real estate assets and debt service coverage. The covenants also provide that the cumulative dividends declared or paid from December 31, 1993, through the end of the current period cannot exceed Funds From Operations (as defined in the agreement) plus an additional $20.0 million for the same period unless required to maintain REIT status. Interest is paid semiannually in arrears. At December 31, 2023 and 2022, the Company was in compliance with all of the financial covenants under the indentures. |  |
Covenant compliance |  | At December 31, 2023 and 2022, the Company was in compliance with all of the financial covenants under the indentures. |  |
Revolving credit facility |  | $ 0 | $ 0 |
Gross fees paid for revolving credit facilities and term loans |  | 2,100 | 2,200 | $ 2,100
Mortgage Payable [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Net book value of investments and real estate collateralizing mortgages payable |  | $ 119,900 |  |
Mortgage Payable [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate |  | 3.80% |  |
Mortgage Payable [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate |  | 6.70% |  |
Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings |  | $ 200,000 | $ 200,000 |
Fixed interest rate |  | 3.80% | 3.80% |
Term Loan [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loan | $ 200,000 |  |  |
Percentage of converted fixed interest rate | 2.75% |  |  |
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Revolving credit facility |  | $ 0 | $ 0 |
Revolving Credit Facility [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Specified spread line of credit |  | 10 basis-point |  |
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes, Weighted Average Interest Rate |  | 4.20% | 4.10% |
Unsecured Debt [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Covenant compliance |  | The Company was in compliance with these financial covenants at December 31, 2023 and 2022. |  |
Unsecured Debt [Member] | Revolving Credit Facility [Member] | Alternative Base Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Specified spread line of credit facility |  | 0.00% |  |
Unsecured Debt [Member] | Revolving Credit Facility [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Specified spread line of credit facility |  | 0.85% |  |
Unsecured Debt [Member] | Wells Fargo Bank National Association [Member] | Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, maximum increasable amount |  |  | $ 800,000 |
Term loan maturity date |  |  | 2027-06 |
Delayed draw feature amount |  |  | $ 100,000 |
Amount of term loan amended and restated |  |  | $ 100,000 |
Covenant compliance |  | Company was in compliance with these financial covenants at December 31, 2023 and 2022 |  |
Unsecured Debt [Member] | Wells Fargo Bank National Association [Member] | Term Loan [Member] | Alternative Base Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Specified spread line of credit facility |  | 0.00% |  |
Unsecured Debt [Member] | Wells Fargo Bank National Association [Member] | Term Loan [Member] | SOFR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Specified spread line of credit facility |  | 0.95% |  |
Specified spread line of credit |  | 10-basis point |  |

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