Transaction and Other Costs (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Transaction and Other Costs.
Completed, potential and pursued transaction expenses	$ 34	$ 227	$ 1,541	$ 274
Severance and other costs	505	1,799	512	3,247
Demolition costs	285	1,466	285	2,443
Transaction and other costs	$ 824	$ 3,492	$ 2,338	$ 5,964

Amount of expenses associated with completed, potential and integrated transactions.

No definition available.

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