Investments In Unconsolidated Joint Ventures (KPG-P 100 IMW JV, LLC) (Details) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
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Dec. 31, 2013
KPG-IMW Owner, LLC [Member]
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Dec. 09, 2013
KPG-IMW Owner, LLC [Member]
Dec. 31, 2013
KPG-MCG IMW, LLC [Member]
Dec. 31, 2013
KPG-P [Member]
Dec. 09, 2013
KPG-P 100 IMW JV, LLC [Member]
Dec. 09, 2013
100 IMW Property [Member]
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sqft
Dec. 31, 2013
100 IMW Property [Member]
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sqft
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Minimum [Member]
100 IMW Property [Member]
Dec. 31, 2013
KPG-MCG's Interest In KPG-P [Member]
Dec. 31, 2013
KPG's Interest In KPG-P [Member]
Dec. 31, 2013
Parkway's Interest In KPG-P [Member]
Schedule of Equity Method Investments [Line Items]                          
Percentage of interest in venture     33.33% 57.7677%         7.50%        
Number of stories             9            
Area of property (in square feet)             400,000            
Business acquisition, cash paid           $ 2,800,000 $ 40,500,000            
Total project costs                   20,000,000      
Area of property to be converted               55,000          
Number of parking spaces 850             110          
Investment ownership percentage                     57.7024% 17.8928% 24.4048%
Threshold of member unreturned capital for distribution of net operating cash flows         0                
Threshold of member unreturned capital for distribution of capital event flows         0                
Threshold of member deferred unreturned capital for distribution of capital event flows         0                
Mortgage loans, carrying amount   $ 61,500,000                      
Interest rate   700.00%                      
Mortgage loan, maturity date   September 2016                      
Number of extension options   2                      
Credit facility, extension period   1 year                      
Holding and distribution pattern under operating agreement         In general, the operating agreement of KPG-P provides that net operating cash flows are distributed first, to the members in proportion to their unreturned capital contributions, until each member's unreturned capital contributions have been reduced to zero; and, thereafter, to the members, in accordance with their percentage interests. Net cash flows from a capital event are distributed first, to the members in proportion to the members' unreturned capital contributions, until each member's unreturned capital contributions have been reduced to zero; second, to the members in proportion to the members' unreturned deferred capital contributions, until each member's deferred unreturned capital contributions have been reduced to zero; and, thereafter, to the members in accordance with their percentage interests.