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Commitments and Contingencies (Textual) (Details) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 03, 2015 ft² Floor | Apr. 02, 2015 USD ($) | Sep. 30, 2017 USD ($) a | Sep. 30, 2017 USD ($) a | Jul. 01, 2016 a Parcel
Subaru Corporate Headquarters Project [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Number of floors | Floor | 5 |  |  |  |
Area of office property | ft² | 250,000 |  |  |  |
Residual profit recognized |  |  | $ 2,100,000 | $ 2,100,000 |
Residual profit earned |  |  | 800,000 | 1,600,000 |
NTE Amount |  |  | 79,400,000 | 79,400,000 |
Project costs funded |  |  | 57,200,000 | 57,200,000 |
Subaru Build-to-Service Center Project [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Lease terms | 18 years |  |  |  |
Rentable Square Feet | ft² | 83,000 |  |  |  |
Purchase option of lease from inception period | 5 years |  |  |  |
Estimated project costs |  |  | 44,300,000 | 44,300,000 |
Subaru Build-to-Service Center Project [Member] | Other Assets [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Project costs funded |  |  | 12,400,000 | 12,400,000 |
1919 Venture [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Guarantees, maximum exposure amount |  |  | 88,900,000 | 88,900,000 |
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Real estate ventures aggregate indebtedness to third parties |  |  | 915,000,000 | 915,000,000 |
evo at Cira Centre South Venture [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Guarantees, maximum exposure amount |  |  | 55,400,000 | 55,400,000 |
PJP VII [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Guarantees, maximum exposure amount |  |  | 400,000 | 400,000 |
618 Market Street [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Contingent consideration, liability |  | $ 2,000,000 | $ 1,800,000 | $ 1,800,000 |
Fair value of contingent consideration |  | 1,600,000 |  |  |
Interest expense |  | $ 2,000,000 |  |  |
Garza Land Acquisition [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Acreage of land | a |  |  |  |  | 34.6
Number of Parcels | Parcel |  |  |  |  | 2
Garza Land Acquisition [Member] | Parcel One [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Area of land sold | a |  |  | 8.4 | 8.4 |
Garza Land Acquisition [Member] | Parcel Two [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Area of land sold | a |  |  | 1.7 | 1.7 |
Garza Land Acquisition [Member] | A1000 Atrium Way And Libertyview |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Infrastructure improvements to land, estimated cost |  |  | $ 13,200,000 | $ 13,200,000 |
Put Agreement [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Purchase price |  |  | 35,000,000 | $ 35,000,000 |
Minimum [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Lease terms |  |  |  | 12 years |
Maximum [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Lease terms |  |  |  | 72 years |
Mortgage Lenders [Member] |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |
Associated letter of credit |  |  | $ 10,000,000 | $ 10,000,000 |

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