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Investment in Unconsolidated Real Estate Ventures (Textual) (Details) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 10, 2018 USD ($) property | Jan. 05, 2018 USD ($) ft² | Mar. 31, 2018 USD ($) ft² a Real_Estate_Investment Apartment_unit | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Investment in Real Estate Ventures, equity method |  |  | $ 171,383,000 |  | $ 194,621,000
Management fees |  |  | 7,674,000 | $ 6,485,000 |
Accounts receivable |  |  | $ 17,794,000 |  | 17,938,000
Area of real estate property | ft² |  |  | 16,501,024 |  |
Net gain on Real Estate Venture transactions |  |  | $ 37,263,000 | 14,582,000 |
Proceeds from real estate venture sales |  |  | $ 42,953,000 | 27,230,000 |
Evo at Cira Disposition [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Sale of ownership interest percentage | 50.00% |  |  |  |
Net gain on Real Estate Venture transactions | $ 25,700,000 |  |  |  |
Number of property units sold | property | 345 |  |  |  |
Sales Price | $ 197,500,000 |  |  |  |
Proceeds from real estate venture sales | 43,000,000 |  |  |  |
Cost of equity method investment | 17,300,000 |  |  |  |
Philadelphia [Member] | Pennsylvania [Member] | Evo at Cira Disposition [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Principal balance of secured loan | $ 110,900,000 |  |  |  |
Office Properties [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Area of real estate property | ft² |  |  | 15,004,862 |  |
Real Estate Venture [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Management fees |  |  | $ 1,300,000 | 1,500,000 |
Accounts receivable |  |  | 1,400,000 |  | $ 900,000
Real Estate Venture [Member] | Lease Commission Income [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Management fees |  |  | $ 800,000 | $ 1,300,000 |
Unconsolidated Real Estate Ventures [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | Real_Estate_Investment |  |  | 10 |  |
Investment in Real Estate Ventures, equity method |  |  | $ 171,400,000 |  |
Real estate ventures aggregate indebtedness to third parties |  |  | $ 639,300,000 |  |
Unconsolidated Real Estate Ventures [Member] | Minimum [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment percentage |  |  | 25.00% | 20.00% |
Unconsolidated Real Estate Ventures [Member] | Maximum [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment percentage |  |  | 70.00% | 70.00% |
Unconsolidated Real Estate Ventures [Member] | Six Real Estate Ventures [Member] | Office Properties [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | Real_Estate_Investment |  |  | 6 |  |
Rentable Square Feet | ft² |  |  | 6,600,000 |  |
Unconsolidated Real Estate Ventures [Member] | Two Real Estate Ventures [Member] | Land Held For Development [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | Real_Estate_Investment |  |  | 2 |  |
Acreage of land | a |  |  | 1.4 |  |
Unconsolidated Real Estate Ventures [Member] | One Real Estate Venture [Member] | Land Under Active Development [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | Real_Estate_Investment |  |  | 1 |  |
Acreage of land | a |  |  | 1.3 |  |
Unconsolidated Real Estate Ventures [Member] | One Other Real Estate Venture [Member] | Residential Tower [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Number of unconsolidated investments in Real Estate Ventures | Real_Estate_Investment |  |  | 1 |  |
Number of Property units | Apartment_unit |  |  | 321 |  |
Four Tower Bridge [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investment percentage |  | 35.00% |  |  |
Net gain on Real Estate Venture transactions |  | $ 11,600,000 |  |  |
Four Tower Bridge [Member] | Conshohocken [Member] | Pennsylvania [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Area of real estate property | ft² |  | 86,021 |  |  |
Real estate property debt |  | $ 9,700,000 |  |  |
Seven Tower Bridge [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Sale of ownership interest percentage |  | 20.00% |  |  |
PJP VII [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Real estate property debt |  |  | $ 4,300,000 |  |
Guarantees, maximum exposure amount |  |  | 400,000 |  |
4040 Wilson Venture [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Guarantees, maximum exposure amount |  |  | 41,300,000 |  |
Loan total borrowing capacity |  |  | $ 150,000,000 |  |

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