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Real Estate - Additional Information (Detail) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 29, 2021 USD ($) shares | Mar. 15, 2021 USD ($) | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) | Mar. 05, 2021 USD ($) a | Dec. 31, 2019 USD ($) | Nov. 05, 2019 a
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Lessee, operating lease, incremental borrowing rate |  |  | 5.63% |  |  |  |  |
Finance lease, right-of-use asset, amortization |  |  |  | $ 104,000 |  |  |  |
Finance lease, interest expense |  |  |  | 362,800 |  |  |  |
Total purchase price |  |  | $ 2,408,136,000 | 2,284,126,000 | $ 2,124,796,000 |  | $ 2,081,597,000 |
Below market lease, carrying amount |  |  | 23,300,000 | 23,300,000 |  |  |  |
Below market lease, accumulated amortization |  |  | 17,300,000 | 16,000,000 |  |  |  |
Accretion income, intangible liabilities |  |  | 1,300,000 | 1,400,000 | 1,400,000 |  |  |
Leasehold Interest Contributed In Contribution Agreement |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Asset acquisition, consideration transferred | $ 21,500,000 |  |  |  |  |  |  |
Payments to acquire businesses, gross | $ 700,000 |  |  |  |  |  |  |
Lease acquisition costs |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Intangible assets gross carrying amount |  |  | 10,700,000 | 11,000,000 |  |  |  |
Intangible assets, accumulated amortization |  |  | 9,200,000 | 9,100,000 |  |  |  |
Amortization expense |  |  | $ 400,000 | 500,000 | 600,000 |  |  |
Weighted-average amortization period |  |  | 4 years 7 months 6 days |  |  |  |  |
Above Market Leases |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Intangible assets gross carrying amount |  |  | $ 600,000 | 600,000 |  |  |  |
Intangible assets, accumulated amortization |  |  | 194,800 | 161,800 |  |  |  |
Amortization expense |  |  | $ 32,900 | 32,900 | $ 43,600 |  |  |
Weighted-average amortization period |  |  | 6 years 3 months 18 days |  |  |  |  |
Below Market Leases |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Weighted-average amortization period |  |  | 4 years 10 months 24 days |  |  |  |  |
2018 Acquisitions |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Total purchase price |  |  |  | $ 108,300,000 |  |  |  |
Limited Partner | Leasehold Interest Contributed In Contribution Agreement |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, shares, acquisitions | shares | 469,740 |  |  |  |  |  |  |
Contribution Agreement |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Business acquisition, transaction costs |  |  |  |  |  | $ 1,200,000 |  |
Right-of-use asset obtained in exchange for finance lease liability |  | $ 19,400,000 |  |  |  |  |  |
Finance lease, liability |  |  |  |  |  | $ 19,400,000 |  |
Contribution Agreement | BF Saul Real Estate Investment Trust |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Area of land | a |  |  |  |  |  |  |  | 10.3
Twinbrook Metro Station |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, shares, acquisitions | shares |  |  |  | 469,740,000 |  |  |  |
Twinbrook Metro Station | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Stock issued during period, shares, acquisitions | shares |  |  | 1,416,071,000 |  |  |  |  |
Twinbrook Metro Station | Contribution Agreement | BF Saul Real Estate Investment Trust |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Area of land | a |  |  |  |  |  | 6.8 |  | 6.8
Twinbrook Metro Station Leasehold Interest | Contribution Agreement | BF Saul Real Estate Investment Trust |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Area of land | a |  |  |  |  |  | 1.3 |  | 1.3
Twinbrook Quarter |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Business acquisition, expenses reimbursed |  |  |  |  |  | $ 7,400,000 |  |

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