Investment in Office Properties and Parking Properties (Details) (USD $)	6 Months Ended			0 Months Ended			0 Months Ended
	Jun. 30, 2014 State	Jun. 30, 2013	Dec. 31, 2013 Office Building Thomas Properties Group, Inc Property	Jan. 30, 2014 Office Building JTB Center Property	Apr. 10, 2014 Office Building Courvoisier Centre Property	Jun. 30, 2014 Property Subject to Operating Lease Office Building Property	Apr. 10, 2014 FLORIDA Courvoisier Centre		Apr. 14, 2014 FLORIDA One Orlando Center	Jun. 30, 2014 Hayden Ferry Lakeside III, IV and V	Apr. 14, 2014 Hayden Ferry Lakeside III, IV and V	Apr. 14, 2014 First Mortgage FLORIDA One Orlando Center	Apr. 14, 2014 Second Mortgage FLORIDA One Orlando Center
Business Acquisition [Line Items]
Number of real estate properties			2	3	2	44
Number of states in which office properties located	8
Acquisition purchase price				$ 33,300,000			$ 145,800,000	[1]	$ 55,100,000
Debt instrument face amount												54,000,000	15,300,000
Parkway's Ownership %											70.00%
Cumulative development costs incurred										4,700,000
Payments to acquire equity method investments	3,536,000	0							8,000,000
Payments to acquire remaining noncontrolling interest in the borrower	43,502,000	0							1,100,000
Percentage of voting interests acquired									100.00%
Debt assumed in a business combination									$ 68,300,000

[1] The purchase price of Courvoisier Center was reduced by $5.3 million of credits from the seller.