Variable Interest Entities (Details) $ in Thousands	Jun. 30, 2022 USD ($) item	Dec. 31, 2021 USD ($) item
Variable Interest Entity [Line Items]
Assets	$ 5,579,902	$ 6,386,206
Liabilities	$ 2,235,305	2,925,064
JBG Smith, LP
Variable Interest Entity [Line Items]
Ownership interest by parent	88.40%
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	$ 149,000	$ 145,200
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Number of consolidated variable interest entities | item	2	3
Assets	$ 135,400	$ 269,700
Liabilities	$ 24,600	$ 13,900