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Related Party Transactions and Investments in Non-Consolidated Entities (Details) (USD $)				0 Months Ended	1 Months Ended
	Mar. 31, 2013 entity	Dec. 31, 2012 entity	Mar. 31, 2012 entity	Jan. 04, 2013 FSP Phoenix Tower Corp	Sep. 30, 2006 FSP Phoenix Tower Corp	Mar. 31, 2013 FSP Phoenix Tower Corp	Dec. 20, 2012 FSP Phoenix Tower Corp
Related Party Transactions and Investments in Non-Consolidated Entities
Sponsored REITs (in entities)	15	15	16
Number of REITs in which the entity holds non-controlling preferred stock interest	2
Sponsored REIT
Preferred shares purchased					48
Percentage of outstanding preferred shares purchased					4.60%
Beneficial interest (in dollars)						$ 110,000	$ 4,862,000
Amount received				$ 4,752,000

X

- Definition

Represents the percentage of the equity method investee's outstanding preferred stock purchased by the entity during the reporting period.

+ References

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- Definition

The number of preferred stock purchased in the investee accounted for under the equity method of accounting.

+ References

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- Definition

Represents the number of entities in which the reporting entity has a non-controlling preferred stock interest.

+ References

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- Definition

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

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: 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



Reference 2: 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=16385135&loc=d3e33749-111570

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Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

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