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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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Number of sponsored real estate investment trusts in which the entity has an interest.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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