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Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 0 Months Ended
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Jun. 30, 2013 sqft | Mar. 31, 2013 | Jun. 30, 2012 sqft | Mar. 31, 2012 | Jul. 15, 2013 Subsequent event Second office property in Denver, Colorado sqft item | Jul. 02, 2013 Subsequent event Office Property in Atlanta Georgia [Member] sqft | Jul. 18, 2013 Subsequent event FSP Galleria North Corp. | Jul. 12, 2013 Cash distribution declared Subsequent event
Subsequent events |  |  |  |  |  |  |  |
Cash dividend declared per share (in dollars per share) | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 |  |  |  | $ 0.19
Number of stories in office building |  |  |  |  | 20 |  |  |
Area of property (in square feet) | 8,529,752 |  | 7,052,592 |  | 655,565 | 621,007 |  |
Purchase price of property acquired |  |  |  |  | $ 217.0 | $ 157.9 |  |
Advance paid to related party pursuant to a Sponsored REIT Loan |  |  |  |  |  |  | $ 0.4 |

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- Definition Reflects the amount of advances paid to related parties pursuant to a Sponsored REIT Loan. + References No definition available. + Details
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Namespace Prefix: | fsp_
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Balance Type: | credit
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- Definition Represents the number of stories in the office building. + References No definition available. + Details
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Namespace Prefix: | fsp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the aggregate purchase price excluding closing costs and adjustments of real estate properties acquired by the entity during the period. + References No definition available. + Details
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Namespace Prefix: | fsp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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- Details
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