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Related Party Transactions and Investments in Non-Consolidated Entities (Details) (USD $) |  |  |  | 0 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 entity | Dec. 31, 2012 entity | Jun. 30, 2012 entity | Jan. 04, 2013 FSP Phoenix Tower Corp | Sep. 30, 2006 FSP Phoenix Tower Corp | Jun. 30, 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 |  |  |

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