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Noncontrolling Interests - Holders of Convertible Limited Partnership Units in the Operating Partnership (Details) - Noncontrolling Interests shares in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 shares | Jun. 30, 2019 shares | Jun. 30, 2020 shares | Jun. 30, 2019 shares
Noncontrolling Interest [Line Items] |  |  |  |
Limited partnership units (in shares) | 7.9 |  | 7.9 |
Limited partnership units, conversion ratio | 1 |  | 1 |
Outstanding stock percent that should be acquired for rights to be exercised | 39.90% |  | 39.90% |
Limited partnership units convertible into shares of common stock, eligible for conversion (in shares) | 1.8 |  | 1.8 |
Fully converted partnership units and diluted weighted average shares outstanding (in shares) | 31.2 | 30.8 | 31.2 | 30.8
Saul Holdings Limited Partnership |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Percentage of ownership interest of noncontrolling interest | 25.40% |  | 25.40% |

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- Definition Limited Partners' Capital Account, Convertible Units, Eligible for Conversion + References No definition available. + Details
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- Definition The number of limited partner units outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 + Details
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