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Real Estate - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 09, 2018 shares | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | May 31, 2018 USD ($) a shares | Mar. 31, 2017 USD ($) | Jan. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) property | Sep. 01, 2019 USD ($) tenant | Dec. 31, 2016 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rent expense |  |  |  |  |  |  |  | $ 779,800 | $ 774,700 |  |
Acquisition costs |  |  |  | $ 200,000 |  |  |  |  |  |  |
Development in process |  | $ 185,972,000 |  |  |  |  | $ 335,644,000 | 185,972,000 |  |  |
Total purchase price |  | 1,948,165,000 |  |  |  |  | 2,081,597,000 | 1,948,165,000 | $ 1,803,200,000 |  | $ 1,700,813,000
Number of properties acquired | property |  |  |  |  |  |  |  |  | 1 |  |
Purchase price allocated to land |  |  |  |  |  |  | 453,322,000 |  |  |  |
Purchase price allocated to buildings |  |  |  |  |  |  | 1,292,631,000 |  |  |  |
Below market lease, carrying amount |  | 24,800,000 |  |  |  |  | 24,100,000 | 24,800,000 |  |  |
Below market lease, accumulated amortization |  | 13,100,000 |  |  |  |  | 13,900,000 | 13,100,000 |  |  |
Accretion income, intangible liabilities |  |  |  |  |  |  | 1,500,000 | 1,700,000 | $ 1,700,000 |  |
Lease acquisition costs |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets gross carrying amount |  | 12,500,000 |  |  |  |  | 11,700,000 | 12,500,000 |  |  |
Intangible assets, accumulated amortization |  | 8,100,000 |  |  |  |  | 8,500,000 | 8,100,000 |  |  |
Amortization expense |  |  |  |  |  |  | $ 900,000 | 1,300,000 | 1,100,000 |  |
Weighted-average amortization period |  |  |  |  |  |  | 4 years 6 months |  |  |  |
Above Market Rent |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets gross carrying amount |  | 800,000 |  |  |  |  | $ 600,000 | 800,000 |  |  |
Intangible assets, accumulated amortization |  | 143,900 |  |  |  |  | 108,300 | 143,900 |  |  |
Amortization expense |  |  |  |  |  |  | $ 109,600 | 110,500 | 31,600 |  |
Weighted-average amortization period |  |  |  |  |  |  | 7 years 7 months 6 days |  |  |  |
Below Market Rent |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted-average amortization period |  |  |  |  |  |  | 5 years 3 months 18 days |  |  |  |
Burtonsville Town Square |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  |  | $ 76,400,000 |  |  | 76,400,000 |  |
Purchase price allocated to land |  |  |  |  |  |  |  |  | 28,400,000 |  |
Purchase price allocated to buildings |  |  |  |  |  |  |  |  | 45,800,000 |  |
Burtonsville Town Square | In-place Leases |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  | 2,200,000 |  |
Burtonsville Town Square | Above Market Rent |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  | 600,000 |  |
Burtonsville Town Square | Below Market Rent |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  | $ 600,000 |  |
Olney |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  |  | $ 3,100,000 |  |  |  |  |  |
Rent expense |  |  |  |  | $ 56,000 |  |  |  |  |  |
2018 Acquisitions |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  | 49,450,000 |  |  |  |  |  | 49,450,000 |  |  |
Purchase price allocated to land |  | 47,438,000 |  |  |  |  |  | 47,438,000 |  |  |
Purchase price allocated to buildings |  | 979,000 |  |  |  |  |  | 979,000 |  |  |
2018 Acquisitions | In-place Leases |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | 886,000 |  |  |  |  |  | 886,000 |  |  |
2018 Acquisitions | Above Market Rent |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | 168,000 |  |  |  |  |  | 168,000 |  |  |
2018 Acquisitions | Below Market Rent |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  | 21,000 |  |  |  |  |  | 21,000 |  |  |
Ashbrook Marketplace |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Limited partnership units issued |  |  |  | $ 8,800,000 |  |  |  | 8,776,000 |  |  |
Development in process |  | 11,124,000 |  |  |  |  | $ 19,128,000 | 11,124,000 |  |  |
7316 Wisconsin Avenue |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 35,500,000 |  |  |  |  |  |  |  |
Acquisition costs |  |  | $ 700,000 |  |  |  |  |  |  |  |
Number of tenants | tenant |  |  |  |  |  |  |  |  |  | 2 |
Development in process |  | 0 |  |  |  |  | $ 44,638,000 | $ 0 |  | $ 42,600,000 |
Parcel Adjacent to 7316 Wisconsin Avenue |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 4,500,000 |  |  |  |  |  |  |  |  |
BF Saul Real Estate Investment Trust | Ashbrook Marketplace |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Limited partnership units issued (in shares) | shares | 176,680 |  |  | 176,680 |  |  |  |  |  |  |
Area of land | a |  |  |  | 13.7 |  |  |  |  |  |  |

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