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Segment Information - Real Estate Investments, at Cost of Company's Reportable Segments (Parenthetical) (Details) - property | Sep. 30, 2016 | Dec. 31, 2015
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Segment Reporting Information [Line Items] |  |
Number of Properties | 117 |
Office Properties [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Properties | 99 |
Held for Sale Properties Included in Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Properties | 4 |
Held for Sale Properties Included in Continuing Operations [Member] | Office Properties [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Properties | 3 |
Cira Square [Member] | Held for Sale Properties Included in Continuing Operations [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Properties |  | 58
620, 640 and 660 Allendale Road [Member] | Held for Sale Properties Included in Continuing Operations [Member] | Office Properties [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Properties | 1 |
Oakland Lot B [Member] | Held for Sale Properties Included in Continuing Operations [Member] | Office Properties [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Properties | 1 |
Marine Center Piers [Member] | Held for Sale Properties Included in Continuing Operations [Member] | Office Properties [Member] |  |
Segment Reporting Information [Line Items] |  |
Number of Properties | 1 |

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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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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- Details
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- Details
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- Details
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- Details
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