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Commitments and Contingencies (Textual) (Details) $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 02, 2015 USD ($) | Sep. 30, 2016 USD ($) | Jul. 02, 2016 USD ($) a | Dec. 03, 2015 USD ($)
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Associated letter of credit |  | $ 10.0 |  |
Future capital expenditures for tenant improvements |  | 36.4 |  |
Future capital expenditures for capital improvements |  | 5.9 |  |
Development And Redevelopment [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Contractual obligations |  | 144.3 |  |
Subaru of America [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
NTE Amount |  |  |  | $ 77.3
TB-BDN Plymouth Apartments [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Guarantor obligations, current carrying value |  | 3.2 |  |
Construction Loan |  | 56.0 |  |
1919 Venture [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Guarantor obligations, current carrying value |  | 88.9 |  |
PJP VII [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Guarantor obligations, current carrying value |  | 0.5 |  |
A618 Market Street |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Contingent consideration, liability | $ 2.0 | 1.7 |  |
Fair value of contingent consideration | 1.6 |  |  |
Interest expense | $ 2.0 |  |  |
Garza Land Acquisition [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Acreage of land | a |  |  | 34.6 |
Area of land under agreement to sell | a |  |  | 9.5 |
Infrastructure improvements to land, estimated cost |  |  | $ 5.8 |
Put Option [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Purchase price |  | $ 35.0 |  |
Minimum [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Lease terms |  | 5 years |  |
Maximum [Member] |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |
Lease terms |  | 73 years |  |

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