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Financial Instruments and Fair Value Measurements - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Gain on disposition of properties |  |  | $ 30,324,000 | $ 5,140,000 | $ 48,886,000
Impairment charge | $ 300,000 | $ 1,400,000 | 1,721,000 |  | 14,455,000
Reclassification adjustment related to derivatives from AOCI to interest expense |  |  | 5,200,000 |  |
Derivatives designated as fair value hedges |  |  | 0 | 0 |
Derivative designated to hedges of net investments in foreign operations |  |  | $ 0 | 0 |
Nonrecurring | Disposal group, held-for-sale |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charge |  |  |  | 0 |
Nonrecurring | Disposal group, held-for-sale | Fund IV | 210 Bowery property |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Gain on disposition of properties |  |  |  | 0 |
Impairment charge | 300,000 | 1,400,000 |  | $ 0 |
Nonrecurring | Disposal group, held-for-sale | Property Classified As Held For Sale At September 30, 2017 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charge |  |  |  |  | 3,800,000
Nonrecurring | Disposal group, held-for-sale | Property Classified As Held For Sale At December 31, 2017 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charge |  |  |  |  | 10,600,000
Nonrecurring | Disposal group, held-for-sale | Noncontrolling Interests | Fund IV | 210 Bowery property |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charge | $ 200,000 | $ 1,100,000 |  |  |
Nonrecurring | Disposal group, held-for-sale | Noncontrolling Interests | Property Classified As Held For Sale At September 30, 2017 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charge |  |  |  |  | 2,700,000
Nonrecurring | Disposal group, held-for-sale | Noncontrolling Interests | Property Classified As Held For Sale At December 31, 2017 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charge |  |  |  |  | $ 7,600,000

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