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Significant Accounting Policies (Details 3) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 item | Dec. 31, 2012 item
Acquired real estate leases and amortization |  |  |
Number of acquisitions of properties with leases |  | 3 fsp_NumberOfDirectAcquisitionsOfPropertiesWithLeases | 2 fsp_NumberOfDirectAcquisitionsOfPropertiesWithLeases
Amortization expense | $ 635,000 us-gaap_AmortizationOfIntangibleAssets | $ (365,000)us-gaap_AmortizationOfIntangibleAssets | $ 71,000 us-gaap_AmortizationOfIntangibleAssets
Acquired in-place and above market real estate leases |  |  |
Acquired real estate leases and amortization |  |  |
Amortization expense | 44,701,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fsp_LeasesAcquiredInPlaceAndAboveMarketAdjustmentMember | 32,230,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fsp_LeasesAcquiredInPlaceAndAboveMarketAdjustmentMember | 19,174,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fsp_LeasesAcquiredInPlaceAndAboveMarketAdjustmentMember
Estimated annual amortization for succeeding five years |  |  |
2015 | 36,715,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fsp_LeasesAcquiredInPlaceAndAboveMarketAdjustmentMember |  |
2016 | 30,154,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fsp_LeasesAcquiredInPlaceAndAboveMarketAdjustmentMember |  |
2017 | 23,907,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fsp_LeasesAcquiredInPlaceAndAboveMarketAdjustmentMember |  |
2018 | 18,752,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fsp_LeasesAcquiredInPlaceAndAboveMarketAdjustmentMember |  |
2019 | 12,628,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fsp_LeasesAcquiredInPlaceAndAboveMarketAdjustmentMember |  |
2020 and thereafter | $ 16,558,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fsp_LeasesAcquiredInPlaceAndAboveMarketAdjustmentMember |  |
Acquired in-place and above market real estate leases | Minimum |  |  |
Acquired real estate leases and amortization |  |  |
Term of lease | 8 months |  |
Acquired in-place and above market real estate leases | Maximum |  |  |
Acquired real estate leases and amortization |  |  |
Term of lease | 281 months |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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