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Subsequent Events (Details) - Subsequent Event [Member] - USD ($) $ in Millions | 1 Months Ended
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Feb. 24, 2017 | Jan. 31, 2017
Fund III [Member] | Arundel Plaza [Member] |  |
Subsequent Event [Line Items] |  |
Sales Price | $ 28.8 |
Fund IV [Member] | 2819 Kennedy Boulevard [Member] |  |
Subsequent Event [Line Items] |  |
Sales Price |  | $ 19.0
Wake Forest Crossing [Member] | Fund IV [Member] |  |
Subsequent Event [Line Items] |  |
Borrowings, amount | $ 24.0 |
London Interbank Offered Rate (LIBOR) [Member] | Wake Forest Crossing [Member] | Fund IV [Member] |  |
Subsequent Event [Line Items] |  |
Basis spread on variable rate | 1.60% |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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