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Financial Instruments and Fair Value Measurements - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Gain on disposition of properties |  | $ 33,000 | $ 2,014,000 | $ 33,000 |
Impairment charges | $ 1,400,000 |  | 1,400,000 |  |
Reclassification adjustment related to derivatives from AOCI to interest expense |  |  | 3,400,000 |  |
Derivatives designated as fair value hedges | 0 |  | 0 |  | $ 0
Derivative designated to hedges of net investments in foreign operations | 0 |  | $ 0 |  | 0
Nonrecurring | Disposal group, held-for-sale |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charges |  |  |  | $ 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 charges | 1,400,000 |  |  |  | $ 0
Nonrecurring | Noncontrolling Interests | Disposal group, held-for-sale | Fund IV | 210 Bowery property |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment charges | $ 1,100,000 |  |  |  |

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