Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Overlook Ridge JV 2C/3B, L.L.C.) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (Overlook Ridge JV 2C/3B, L.L.C.) (Narrative) (Details) (USD $)
2 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Overlook Ridge Apartments Investors, L.L.C. [Member]
Mar. 31, 2013
Overlook Ridge Apartments Investors, L.L.C. [Member]
Mar. 31, 2013
Overlook Ridge Apartments Member L.L.C. [Member]
Mar. 31, 2013
Overlook Ridge JV 2C/3B, L.L.C. [Member]
Dec. 31, 2012
Overlook Ridge JV 2C/3B, L.L.C. [Member]
Mar. 31, 2013
Overlook Ridge JV 2C/3B, L.L.C. [Member]
Overlook Ridge Apartments Member L.L.C. [Member]
Dec. 31, 2012
Overlook Ridge JV 2C/3B, L.L.C. [Member]
Rowe [Member]
Dec. 31, 2012
Overlook Ridge JV 2C/3B, L.L.C. [Member]
Parent Company [Member]
Mar. 31, 2013
Overlook Ridge 2C 3B's Interest In Overlook Ridge Apartments Investors [Member]
Mar. 31, 2013
Overlook 2C 3B Project [Member]
Mar. 31, 2013
Overlook 2C 3B Project [Member]
Overlook Ridge Apartments Investors, L.L.C. [Member]
Mar. 31, 2013
Overlook 2C 3B Project [Member]
Overlook Ridge JV 2C/3B, L.L.C. [Member]
item
property
Mar. 31, 2013
Construction Loan [Member]
Overlook Ridge Apartments Investors, L.L.C. [Member]
item
Jan. 18, 2013
Construction Loan [Member]
Overlook Ridge Apartments Investors, L.L.C. [Member]
Mar. 31, 2013
Construction Loan [Member]
Overlook 2C 3B Project [Member]
Overlook Ridge Apartments Investors, L.L.C. [Member]
Mar. 31, 2013
Construction Loan Extension Number 1 [Member]
Overlook Ridge Apartments Investors, L.L.C. [Member]
Dec. 31, 2012
Construction Loan Extension Number 2 [Member]
Overlook Ridge Apartments Investors, L.L.C. [Member]
Mar. 31, 2013
Minimum [Member]
Mar. 31, 2013
Minimum [Member]
Construction Loan [Member]
Overlook Ridge Apartments Investors, L.L.C. [Member]
Mar. 31, 2013
Maximum [Member]
Mar. 31, 2013
Maximum [Member]
Construction Loan [Member]
Overlook Ridge Apartments Investors, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]                                            
Indirect residual ownership percentage         25.00%                                  
Number of units                         371                  
Number of real estate properties                         4                  
Percentage of interest in venture         50.00%                           7.50%   80.00%  
Investment ownership percentage                   50.00%                        
Total project costs                     $ 79,400,000 $ 23,900,000                    
Maximum borrowing capacity 600,000,000                         55,500,000   55,500,000            
Amount outstanding                           0                
Percentage of operating return on capital     6.50%                                      
Capital balance             19,100,000                              
Accumulated unpaid operating return             300,000                              
Percentage of capital event cash flows distributed       100.00%                                    
Initial internal rate of return       9.00%                                    
Percentage of capital event cash flows distributed after initial internal rate of return reached       70.00% 30.00%                                  
Internal rate of return       11.00%                                    
Spread over LIBOR                           2.50%                
Loan maturity date                           Dec. 01, 2015                
Number of extension options                           2                
Loan extension period                           1 year                
Extension fee                                 0.25% 0.25%        
Amount of debt guaranteed by company                           8,300,000                
Threshold of payment guarantee termination, debt service coverage ratio                                       1.25    
Percentage of loan that has a fixed interest rate                                           95.00%
Interest rate                             3.0875%              
Percentage return on unrecovered capital           9.00%                                
Unrecovered notional capital               7,200,000 200,000                          
Development management and other services fees   $ 69,000                                        
Holding and distribution pattern under operating agreement     In general, the operating agreement of Overlook Apartments Investors provides that operating cash flows are distributed to members first to Overlook Apartments Member and then to Overlook 2C/3B based on a 6.5 percent preferred return on each members' capital balance in priorities as detailed in the operating agreement. Excess operating cash flows are distributed to the members in accordance with their ownership percentages.