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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments In and Advances to Unconsolidated Affiliates (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage |  | 65.00% |  |
Due to related parties | $ 2,193 |  | $ 725 |
Other | 957 |  | 566 |
Investments in and advances to unconsolidated affiliates | 272,028 |  | 173,277 |
Distributions in excess of income from, and investments in, unconsolidated affiliates | 13,691 |  | 13,244 |
Core Portfolio [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 165,031 |  | 81,586 |
Core Portfolio [Member] | 840 N. Michigan [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 88.43% |  |  |
Equity method investments | $ 74,131 |  | 76,898 |
Core Portfolio [Member] | Renaissance Portfolio [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 20.00% |  |  |
Equity method investments | $ 36,437 |  | 0 |
Core Portfolio [Member] | Gotham Plaza [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 49.00% |  |  |
Equity method investments | $ 29,421 |  | 0 |
Core Portfolio [Member] | Brandywine Portfolio [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 22.22% |  |  |
Equity method investments | $ 20,755 |  | 0 |
Core Portfolio [Member] | Georgetown Portfolio [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |
Equity method investments | $ 4,287 |  | 4,688 |
Core Portfolio [Member] | Crossroads [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 49.00% |  |  |
Distributions in excess of income from, and investments in, unconsolidated affiliates | $ 13,691 |  | 13,244 |
Mervyns I and Mervyns II [Member] | KLA Mervyns LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 10.50% |  |  |
Equity method investments | $ 0 |  | 0 |
Fund III [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 8,349 |  | 13,438 |
Fund III [Member] | Fund III Other Portfolio [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |
Equity method investments | $ 8,108 |  | 12,784 |
Fund III [Member] | Self Storage Management [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 95.00% |  |  |
Equity method investments | $ 241 |  | 654 |
Fund IV [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 95,498 |  | 76,962 |
Fund IV [Member] | Broughton Street Portfolio [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |
Equity method investments | $ 54,839 |  | 43,786 |
Fund IV [Member] | Fund IV Other Portfolio [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  |
Equity method investments | $ 21,817 |  | 24,104 |
Fund IV [Member] | 650 Bald Hill Road [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 90.00% |  |  | 90.00%
Equity method investments | $ 18,842 |  | $ 9,072 |

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