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Unconsolidated Affiliates and Noncontrolling Interests - Variable Interest Entities (Details) - USD ($) | Mar. 31, 2019 | Sep. 30, 2018
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Ambassador Infrastructure, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | $ 0 |
Maximum Risk of Loss | $ 10,605,000 |
Debt guaranteed (as a percent) | 100.00% |
EastGate Storage, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | $ 1,052,000 |
Maximum Risk of Loss | 6,500,000 |
G&I VIII CBL Triangle LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | 0 |
Maximum Risk of Loss | 0 |
Equity interest in real estate property (as a percent) |  | 90.00%
Self Storage at Mid Rivers, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | 1,022,000 |
Maximum Risk of Loss | 5,987,000 |
Shoppes at Eagle Point, LLC |  |
Noncontrolling Interest [Line Items] |  |
Investment in Real Estate Joint Ventures and Partnerships | 16,295,000 |
Maximum Risk of Loss | $ 12,740,000 |

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