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v3.19.3.a.u2

Organization and Basis of Presentation - Narrative (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) ft² building_unit properties | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | properties | 62 |  |
Parking Income | $ | $ (26,000) | $ (25,700) | $ (23,100)
Reimbursements from Tenants | $ | $ (55,434) | (39,015) | (26,907)
Asset under Construction |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | properties | 7 |  |
Future Development |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | properties | 40 |  |
Area of real estate property (in square feet) | ft² | 21,900,000 |  |
Commercial Real Estate [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | properties | 44 |  |
Area of real estate property (in square feet) | ft² | 12,700,000 |  |
Commercial Real Estate [Member] | Asset under Construction |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | properties | 4 |  |
Area of real estate property (in square feet) | ft² | 943,000 |  |
Multifamily |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | properties | 18 |  |
Number of Units in Real Estate Property | building_unit | 7,111 |  |
Multifamily | Asset under Construction |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Real Estate Properties | properties | 3 |  |
Number of Units in Real Estate Property | building_unit | 1,011 |  |
Wholly Owned Properties | Future Development |  |  |
Real Estate Properties [Line Items] |  |  |
Area of real estate property (in square feet) | ft² | 18,700,000 |  |
Wholly Owned Properties | Commercial Real Estate [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Area of real estate property (in square feet) | ft² | 10,700,000 |  |
Wholly Owned Properties | Commercial Real Estate [Member] | Asset under Construction |  |  |
Real Estate Properties [Line Items] |  |  |
Area of real estate property (in square feet) | ft² | 821,000 |  |
Wholly Owned Properties | Multifamily |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Units in Real Estate Property | building_unit | 5,327 |  |
Wholly Owned Properties | Multifamily | Asset under Construction |  |  |
Real Estate Properties [Line Items] |  |  |
Area of real estate property (in square feet) | ft² | 833 |  |
Restatement Adjustment [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Parking Income | $ |  | 25,700 | 23,100
Reimbursements from Tenants | $ |  | $ 39,300 | $ 38,000
JBG Smith, LP |  |  |
Real Estate Properties [Line Items] |  |  |
Ownership interest by parent | 89.90% |  |

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