Acquisitions (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Lease commisions [Member]	Jun. 30, 2012 Lease in place value [Member]	Jun. 30, 2012 Above market leases [Member]	Jun. 30, 2012 Below market leases [Member]	Jun. 30, 2012 Other intangibles [Member]	Jun. 30, 2012 Buildings [Member]	Jun. 30, 2012 Tenant Improvements [Member]	Jan. 11, 2012 The Pointe [Member] Parkway Properties Office Fund II, LP [Member] sqft	Feb. 10, 2012 Hayden Ferry Lakeside II [Member] Parkway Properties Office Fund II, LP [Member] sqft	Jun. 06, 2012 Hearst Tower [Member] sqft
Business Acquisition [Line Items]
Area of real estate property (in square feet)												252,000	300,000	972,000
Cost of entity acquired												$ 46,900,000	$ 86,000,000	$ 250,000,000
Equity Contribution In A Business Combination												7,000,000	10,800,000
Ownership percentage of property (in hundredths)												30.00%	30.00%
Preliminary allocation of purchase price [Abstract]
Land	12,427,000		12,427,000
Buildings	300,808,000		300,808,000
Tenant improvements	26,478,000		26,478,000
Lease commissions	10,066,000		10,066,000
Lease in place value	27,196,000		27,196,000
Above market leases	5,439,000		5,439,000
Below market leases	(3,676,000)		(3,676,000)
Other intangibles	3,001,000		3,001,000
Property, Plant and Equipment [Line Items]
Weighted average life (in years)										40 years 0 months 0 days	6 years 0 months 0 days
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average life (in years)					6 years 0 months 0 days	6 years 0 months 0 days	5 years 0 months 0 days	7 years 0 months 0 days	3 years 0 months 0 days
Business Acquisition, Pro Forma Revenue	60,796,000	50,039,000	121,057,000	89,174,000
Business Acquisition, Pro Forma Net Income (Loss)	$ 70,000	$ (12,132,000)	$ 2,780,000	$ (17,453,000)
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0	$ (0.56)	$ 0.12	$ (0.81)
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0	$ (0.56)	$ 0.12	$ (0.81)