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Property Rental Revenue (Tables) | 3 Months Ended
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Mar. 31, 2020
Property Rentals Revenue [Abstract] |
Property Rentals Revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2020 |  | 2019
​ | ​ | (In thousands)
Fixed | ​ | $ | 110,933 | ​ | $ | 113,590
Variable | ​ | ​ | 9,447 | ​ | ​ | 5,823
Property rentals revenue | ​ | $ | 120,380 | ​ | $ | 119,413

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- Definition Property rentals revenue + References No definition available. + Details
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Namespace Prefix: | jbgs_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Tabular disclosure of real estate properties and units in those properties that are included in the discussion of the nature of an entity's operations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration