Variable Interest Entities (Details) $ in Thousands	Sep. 30, 2023 USD ($) item	Dec. 31, 2022 USD ($) item
Variable Interest Entity [Line Items]
Assets	$ 5,666,168	$ 5,903,438
Liabilities	$ 2,816,721	2,708,016
JBG Smith, LP
Variable Interest Entity [Line Items]
Ownership interest by parent	87.70%
Unconsolidated VIEs
Variable Interest Entity [Line Items]
Equity Method Investments	$ 85,900	$ 83,200
Consolidated VIEs
Variable Interest Entity [Line Items]
Number of consolidated variable interest entities | item	2	2
Assets	$ 456,100	$ 265,500
Liabilities	$ 245,100	$ 116,300