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Investment in Consolidated and Unconsolidated Entities - Narrative (Details) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2013 USD ($) | Apr. 17, 2013 USD ($) ft² Properties | Mar. 31, 2018 USD ($) ft² | Mar. 31, 2017 USD ($) ft² | Dec. 31, 2017 USD ($) ft² | Sep. 30, 2017 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |  |
Fair value of parking garage |  |  |  | $ 256,583 |  |
Land |  |  |  | 75,194 |  |
Building and other improvements |  |  |  | $ 181,389 |  |
Square Feet | ft² |  |  | 3,000,000 | 300,000 | 3,200,000 |
Carrying value of investment |  |  | $ 188,714 |  | $ 180,764 |
Gross disposition price |  |  | 127,500 | $ 29,050 |  |
Provision for asset impairment |  |  | 797 | 16,440 |  |
Proceeds from sale and transfer of investment properties, net |  |  | 119,825 | $ 28,474 |  |
IAGM Retail Fund I, LLC |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Carrying value of investment |  |  | 131,603 |  | 123,693 |
The Plaza Midtown, Atlanta, GA |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Fair value of parking garage |  |  |  |  |  | $ 10,790
Land |  |  | 1,963 |  | 1,963 |
Building and other improvements |  |  | $ 8,827 |  | $ 8,827 |
Retail |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Square Feet | ft² |  |  | 11,200,000 | 12,700,000 | 12,400,000 |
Bryant Square |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Provision for asset impairment |  |  | $ 370 |  |  |
Proceeds from sale and transfer of investment properties, net |  |  | $ 2,148 |  |  |
Bryant Square | Retail |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Square Feet | ft² |  |  | 268,000 |  |  |
Gross disposition price |  |  | $ 38,000 |  |  |
Provision for asset impairment |  |  | 672 |  |  |
Proceeds from sale and transfer of investment properties, net |  |  | $ 3,905 |  |  |
Unconsolidated Entities | IAGM Retail Fund I, LLC |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Number of retail properties contributed | Properties |  | 13 |  |  |  |
Square Feet | ft² |  | 2,109,324 |  |  |  |
Carrying value of investment | $ 10,298 | $ 96,788 |  |  |  |
Gross disposition price | $ 34,350 | 409,280 |  |  |  |
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 |
Accumulated amortization |  |  |  |  | $ 2,869 |

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