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Redeemable Noncontrolling Interests - Narrative (Details) - shares | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Consolidated Real Estate Venture |  |  |
Noncontrolling Interest [Line Items] |  |  |
Ownership interest by parent, threshold for capital contributions to cease |  | 97.00% |
OP Units |  |  |
Noncontrolling Interest [Line Items] |  |  |
Conversion of common limited partnership units to common shares | 171,978 | 119,178 | 787,253
JBG Smith, LP |  |  |
Noncontrolling Interest [Line Items] |  |  |
Ownership interest by parent |  | 90.50% |
JBG Smith, LP | OP Units |  |  |
Noncontrolling Interest [Line Items] |  |  |
Units outstanding |  | 13,700,000 |
Ownership interest by parent |  | 9.50% |
Consolidated Real Estate Venture |  |  |
Noncontrolling Interest [Line Items] |  |  |
Ownership interest by parent |  | 96.00% |

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- Definition The number of units or equivalent units outstanding for all classes. + 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=120397183&loc=d3e187171-122770 + Details
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