Variable Interest Entities (Details) $ in Thousands	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($) item	Mar. 31, 2021 USD ($) item
Variable Interest Entity [Line Items]
Assets	$ 5,903,438	$ 6,386,206
Liabilities	$ 2,708,016	2,925,064
JBG Smith, LP
Variable Interest Entity [Line Items]
Ownership interest by parent	88.30%
Unconsolidated VIEs
Variable Interest Entity [Line Items]
Equity Method Investments	$ 83,200	$ 145,200
Consolidated VIEs
Variable Interest Entity [Line Items]
Number of consolidated variable interest entities | item	2	3
Assets	$ 265,500	$ 269,700
Liabilities	116,300	$ 13,900
Consolidated VIEs | 1900 Crystal Drive.
Variable Interest Entity [Line Items]
Number of Towers in Real Estate Property | item			2
Ground lessee equity funding obligation			$ 17,500
Mezzanine loan project funding to ground lessee			$ 104,800
Mezzanine loan funded to the ground lessee	96,700
Number of Units in Real Estate Property | item			808
Consolidated VIEs | 2000 and 2001 South Bell Street
Variable Interest Entity [Line Items]
Number of Towers in Real Estate Property | item		2
Ground lessee equity funding obligation		$ 16,000
Mezzanine loan project funding to ground lessee		$ 96,200
Mezzanine loan funded to the ground lessee	$ 31,600
Number of Units in Real Estate Property | item		775