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Financial Instruments and Fair Value Measurements - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Gain on disposition of properties | $ 12,056,000 |  | $ 5,107,000 | $ 14,070,000 | $ 5,140,000 |
Impairment charges | 321,000 |  |  | 1,721,000 |  |
Reclassification adjustment related to derivatives from AOCI to interest expense |  |  |  | 4,800,000 |  |
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 | 300,000 | $ 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 | $ 200,000 | $ 1,100,000 |  |  |  |

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + Details
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