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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage |  |  | 65.00%
Due from related parties | $ 2,415,000 | $ 2,193,000 |
Other | 556,000 | 957,000 |
Investments in and advances to unconsolidated affiliates | 302,070,000 | 272,028,000 |
Distributions in excess of income from, and investments in, unconsolidated affiliates | $ 15,292,000 | 13,691,000 |
KLA Mervyns LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 10.50% |  |
Equity method investments | $ 0 | 0 |
Fund III Other Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 90.00% |  |
Equity method investments | $ 167,000 | 8,108,000 |
Self Storage Management |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 95.00% |  |
Equity method investments | $ 206,000 | 241,000 |
Fund III |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | $ 373,000 | 8,349,000 |
Broughton St. Portfolio Savannah, GA |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
Equity method investments | $ 48,335,000 | 54,839,000 |
Cumulative capital contribution, percentage | 15.00% |  |
Cumulative capital contribution | $ 15,400,000 | 14,500,000 |
Preferred return percentage | 9.00% |  |
Preferred return | $ 36,800,000 | 45,400,000 |
Fund IV Other Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 90.00% |  |
Equity method investments | $ 20,199,000 | 21,817,000 |
650 Bald Hill Road |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 90.00% |  |
Equity method investments | $ 13,609,000 | 18,842,000 |
Fund IV |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | 82,143,000 | 95,498,000 |
Core Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments | $ 216,583,000 | 165,031,000 |
Core Portfolio | 840 N. Michigan |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 88.43% |  |
Equity method investments | $ 69,846,000 | 74,131,000 |
Core Portfolio | Renaissance Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 20.00% |  |
Equity method investments | $ 35,041,000 | 36,437,000 |
Core Portfolio | Gotham Plaza |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 49.00% |  |
Equity method investments | $ 29,416,000 | 29,421,000 |
Core Portfolio | Market Square |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 100.00% |  |
Equity method investments | $ 0 | 5,469,000 |
Core Portfolio | Town Center |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 61.11% |  |
Equity method investments | $ 78,801,000 | 15,286,000 |
Core Portfolio | Georgetown Portfolio |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |
Equity method investments | $ 3,479,000 | 4,287,000 |
Core Portfolio | Crossroads |  |  |
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 | $ 15,292,000 | $ 13,691,000 |

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