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Transaction and Other Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Transaction and Other Costs. |  |  |  |
Completed, potential and pursued transaction expenses | $ 104 | $ 622 | $ 1,645 | $ 896
Severance and other costs | 563 | 1,033 | 1,075 | 4,280
Demolition costs |  | 175 | 285 | 2,618
Transaction and other costs | $ 667 | $ 1,830 | $ 3,005 | $ 7,794

X
- Definition Amount of expenses associated with completed, potential and integrated transactions. + References No definition available. + Details
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Namespace Prefix: | jbgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expenses associated with demolition. + References No definition available. + Details
Name: | jbgs_DemolitionCosts
Namespace Prefix: | jbgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of severance and other costs + References No definition available. + Details
Name: | jbgs_SeveranceAndOtherCosts
Namespace Prefix: | jbgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Transaction And Other Costs + References No definition available. + Details
Name: | jbgs_TransactionAndOtherCosts
Namespace Prefix: | jbgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration