Variable Interest Entities (Details) $ in Thousands	Sep. 30, 2022 USD ($) item	Dec. 31, 2021 USD ($) item
Variable Interest Entity [Line Items]
Assets	$ 5,895,980	$ 6,386,206
Liabilities	$ 2,617,732	2,925,064
JBG Smith, LP
Variable Interest Entity [Line Items]
Ownership interest by parent	88.30%
Unconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	$ 84,700	$ 145,200
Consolidated VIEs
Variable Interest Entity [Line Items]
Number of consolidated variable interest entities | item	2	3
Assets	$ 199,500	$ 269,700
Liabilities	$ 69,700	$ 13,900