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Subsequent Events (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 0 Months Ended
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