Variable Interest Entities (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 item	Mar. 31, 2021 item
Variable Interest Entities
Payment to acquire noncontrolling interests			$ 41	$ 32	$ 182
Purchase of interests			49,447
Assets	$ 5,020,540		5,020,540	5,518,515
Liabilities	$ 2,787,850		$ 2,787,850	2,825,929
1900 Crystal Drive.
Variable Interest Entities
Number of towers in real estate property | item							2
Payment to acquire noncontrolling interests		$ 26,600
Purchase of interests		$ 4,700
JBG Smith, LP
Variable Interest Entities
Ownership interest by parent	86.00%		86.00%
Unconsolidated VIEs
Variable Interest Entities
Equity Method Investments	$ 82,000		$ 82,000	87,300
Consolidated VIEs
Variable Interest Entities
Assets				503,200
Liabilities				$ 293,300
Consolidated VIEs | 2000 and 2001 South Bell Street
Variable Interest Entities
Number of towers in real estate property | item						2
Payment to acquire noncontrolling interests	22,800
Purchase of interests	$ 14,300
Number of units in real estate property | item						775