Transaction and Other Costs (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Transaction and Other Costs.
Completed, potential and pursued transaction expenses	$ 1,507	$ 47
Severance and other costs	7	1,448
Demolition costs		977
Transaction and other costs	$ 1,514	$ 2,472

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