Transaction and Other Costs (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Transaction and Other Costs.
Completed, potential and pursued transaction expenses	$ 674	$ 1,507
Severance and other costs	1,074	7
Demolition costs	163
Transaction and other costs	$ 1,911	$ 1,514

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