Organization and Basis of Presentation - Reclassifications (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Organization and Basis of Presentation
Reclassification from other assets, net to intangible assets, net	$ 202.0

Reclassification from other assets, net to intangible assets, net during the period.

No definition available.

Name:	jbgs_ReclassificationFromOtherAssetsToIntangibleAssetsNetExcludingGoodwill
Namespace Prefix:	jbgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration