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Related Party Transactions and Investments in Non-Consolidated Entities - Investment in Sponsored REITs - Property Sold (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2014
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
FSP 385 Interlocken Development, Corp. |  |
Investment in Sponsored REITs |  |
Repayment of principal | $ 37,500,000 |

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