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Related Party Transactions and Investments in Non-Consolidated Entities - Investment in Sponsored REITs (Details) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 USD ($) | Jan. 04, 2013 USD ($) | Dec. 31, 2013 USD ($) entity | Dec. 31, 2015 entity | Dec. 31, 2014 USD ($) entity | Dec. 31, 2012 entity | Dec. 20, 2012 USD ($)
Related Party Transactions and Investments in Non-Consolidated Entities |  |  |  |  |  |  |
Sponsored REITs (in entities) | entity |  |  | 14 | 9 | 10 | 15 |
Number of REITs in which the entity holds non-controlling preferred stock interest | entity |  |  |  | 2 |  |  |
Number of sponsored REITs having properties which were sold | entity |  |  |  | 1 | 4 |  |
Number of entities holding mortgage loans | entity |  |  |  |  | 2 |  |
FSP 505 Waterford Corp |  |  |  |  |  |  |
Investment in Sponsored REITs |  |  |  |  |  |  |
Repayment of principal |  |  | $ 2,350,000 |  |  |  |
Phoenix Tower |  |  |  |  |  |  |
Investment in Sponsored REITs |  |  |  |  |  |  |
Beneficial interest |  |  |  |  |  |  | $ 4,866,000
Phoenix Tower | Preferred shares ownership |  |  |  |  |  |  |
Investment in Sponsored REITs |  |  |  |  |  |  |
Amount received | $ 96,000 | $ 4,752,000 |  |  |  |  |
FSP Galleria North Corp. |  |  |  |  |  |  |
Investment in Sponsored REITs |  |  |  |  |  |  |
Repayment of principal |  |  |  |  | $ 13,880,000 |  |
FSP Highland Place I Corp. |  |  |  |  |  |  |
Investment in Sponsored REITs |  |  |  |  |  |  |
Repayment of principal |  |  |  |  | $ 3,395,000 |  |

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