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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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Area of a real estate property.

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