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Commitments and Contingencies (Textual) (Details) |  |  | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 03, 2015 ft² | Apr. 02, 2015 USD ($) | Sep. 30, 2004 USD ($) | Dec. 31, 2016 USD ($) ft² a | Jan. 31, 2017 | Jan. 30, 2017 a | Jul. 01, 2016 USD ($) a | Dec. 31, 2015 USD ($)
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Real estate ventures aggregate indebtedness to third parties |  |  |  | $ 997,466,000 |  |  |  | $ 794,571,000
Agreed holding period (not to sell) for properties acquired as part of the TRC acquisition |  |  |  | 15 years |  |  |  |
Subaru Corporate Headquarters Project [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
NTE Amount |  |  |  | $ 78,100,000 |  |  |  |
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 |  |  |  |  |  |  |
Project costs funded |  |  |  | 10,500,000 |  |  |  |
Project costs |  |  |  | 29,300,000 |  |  |  |
Subsequent Event [Member] | Garza Land Sale [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Area of land under agreement to sell | a |  |  |  |  |  | 1.7 |  |
TB-BDN Plymouth Apartments [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Guarantees, maximum exposure amount |  |  |  | 3,200,000 |  |  |  |
Construction Loan |  |  |  | 56,000,000 |  |  |  |
TB-BDN Plymouth Apartments [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Sale of ownership interest percentage |  |  |  |  | 50.00% |  |  |
1919 Venture [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Guarantees, maximum exposure amount |  |  |  | 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 |  |  |  | 997,466,000 |  |  |  |
PJP VII [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Real estate ventures aggregate indebtedness to third parties |  |  |  | 4,956,000 |  |  |  | 5,621,000
Guarantees, maximum exposure amount |  |  |  | 400,000 |  |  |  |
618 Market Street [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Contingent consideration, liability |  | $ 2,000,000 |  | $ 1,700,000 |  |  |  |
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 |
Area of land under agreement to sell | a |  |  |  | 9.5 |  |  |  |
Infrastructure improvements to land, estimated cost |  |  |  |  |  |  | $ 10,300,000 |
Two Logan Square [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Leased Area Of Building | ft² |  |  |  | 708,844 |  |  |  |
Amount to be paid if the Company takes fee title to Two Logan Square upon foreclosure of related mortgage |  |  |  | $ 2,900,000 |  |  |  |
Liability related to acquisition of TRC |  |  | $ 700,000 | $ 2,200,000 |  |  |  |
Commerce Square [Member] | Prentiss Properties Trust [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Non-controlling interest, ownership percentage by non-controlling Owners |  |  |  | 1.00% |  |  |  |
One Commerce Square [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Tax guarantee obligation |  |  |  | $ 125,000,000 |  |  |  |
Two Commerce Square [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Tax guarantee obligation |  |  |  | 100,000,000 |  |  |  |
Put Agreement [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 35,000,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |  |  |
Lease terms |  |  |  | 4 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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