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v3.21.1

Summary of Significant Accounting Policies (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($)
Summary of Significant Accounting Policies |
Lease deferral requests granted - COVID | $ 1.9

X
- Definition Amount of lease deferral requests granted during the period due to unusual event. + References No definition available. + Details
Name: | jbgs_LeaseDeferralRequestsDueToUnusualEvent
Namespace Prefix: | jbgs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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