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v3.20.2

Debt - Summary of Outstanding Debt (Parenthetical) (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
1633 Broadway [Member] |  |
Debt Instrument [Line Items] |  |
Ownership interest rate of property | 90.00% | 90.00%
One Market Plaza [Member] |  |
Debt Instrument [Line Items] |  |
Ownership interest rate of property | 49.00% | 49.00%
300 Mission Street [Member] |  |
Debt Instrument [Line Items] |  |
Ownership interest rate of property | 31.10% | 31.10%

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- Definition Ownership percentage of property. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |