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Investment in Consolidated and Unconsolidated Entities - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 17, 2013 USD ($) | Sep. 30, 2018 USD ($) ft² Property | Sep. 30, 2017 USD ($) ft² | Sep. 30, 2018 USD ($) ft² Property | Sep. 30, 2017 USD ($) ft² Property | Dec. 31, 2017 USD ($) | Dec. 31, 2013 Properties
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Fair value of parking garage |  | $ 150,217 | $ 566,194 | $ 150,217 | $ 566,194 |  |
Land |  | 23,001 | 125,990 | 23,001 | 125,990 |  |
Building and other improvements |  | 127,216 | 440,204 | 127,216 | 440,204 |  |
Proceeds from sale and transfer of investment properties, net |  |  |  | 254,424 | 197,843 |  |
Provision for asset impairment |  | $ 1,405 | $ 0 | $ 3,673 | $ 0 |  |
Number of properties impaired | Property |  | 2 |  | 3 | 3 |  |
Carrying value of investment |  | $ 188,135 |  | $ 188,135 |  | $ 180,764 |
Gross disposition price |  |  |  | 282,950 | $ 206,130 |  |
Provision for asset impairment |  |  |  | 3,510 | $ 16,440 |  |
IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Carrying value of investment |  | $ 128,286 |  | $ 128,286 |  | $ 123,693 |
Retail |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Square Feet | ft² |  | 2,232,000 | 1,250,000 | 2,232,000 | 1,250,000 |  |
Gross disposition price |  |  |  | $ 282,950 | $ 152,630 |  |
Bryant Square | IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Proceeds from sale and transfer of investment properties, net |  |  |  | 2,148 |  |  |
Provision for asset impairment |  | $ 773 |  | 2,020 |  |  |
Bryant Square | Retail | IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Proceeds from sale and transfer of investment properties, net |  |  |  | $ 3,905 |  |  |
Number of properties impaired | Property |  |  |  | 1 |  |  |
Unconsolidated Entities | IAGM Retail Fund I, LLC |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Number of retail properties contributed | Properties |  |  |  |  |  |  | 14
Proceeds from sale and transfer of investment properties, net | $ 15,625 |  |  |  |  |  |
Equity investment basis adjustment, amortization period |  |  |  |  |  | 30 years |
Deferred gain on sale of property |  |  |  |  |  | $ 12,756 |
Provision for asset impairment |  | $ 1,405 |  | $ 3,673 |  |  |
Number of properties impaired | Property |  | 1 |  | 3 |  |  |
PGA Plaza and Kennesaw Marketplace [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Loan advanced to VIE |  | $ 152,300 |  |  |  |  |

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