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Investments in Unconsolidated Entities (Details Textual)
 1 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2013
CAD
Mar. 31, 2013
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Sep. 30, 2013
Dec. 31, 2013
Copper Beech Purchase Agreement [Member]
Dec. 31, 2013
North Carolina [Member]
USD ($)
Dec. 31, 2013
Kentucky [Member]
USD ($)
Dec. 31, 2013
Common Class B [Member]
The Grove at San Angelo Texas [Member]
USD ($)
Dec. 31, 2012
Common Class B [Member]
The Grove at San Angelo Texas [Member]
USD ($)
Dec. 31, 2013
Common Class B [Member]
The Grove at Indiana Pennsylvania [Member]
USD ($)
Dec. 31, 2012
Common Class B [Member]
The Grove at Indiana Pennsylvania [Member]
USD ($)
Dec. 31, 2013
Common Class B [Member]
The Grove at Conway Arkansas [Member]
USD ($)
Dec. 31, 2012
Common Class B [Member]
The Grove at Conway Arkansas [Member]
USD ($)
Dec. 31, 2013
Dcv Holdings [Member]
Dec. 31, 2013
Cb Portfolio [Member]
USD ($)
Dec. 31, 2013
Hsre Campus Crest Llc [Member]
USD ($)
Dec. 31, 2012
Hsre Campus Crest Llc [Member]
USD ($)
Dec. 31, 2011
Hsre Campus Crest Llc [Member]
USD ($)
Schedule of Equity Method Investments [Line Items]                                          
Equity method investment, ownership percentage     48.00% 48.00%       48.00%                 35.00% 67.00%      
Percentage of interest in joint venture   30.00%                                      
Development Construction and Management Services Revenues       $ 51,069,000 $ 54,295,000 $ 35,084,000                         $ 51,100,000 $ 54,300,000 $ 35,100,000
Payments to Acquire Assets, Investing Activities 60,000,000 65,600,000                                      
Interest from Joint Venture Properties                 2,700,000 1,900,000 2,700,000 2,700,000 2,700,000 2,700,000 6,400,000 6,400,000          
Return On Investment Of Properties     9.00% 9.00%                                  
Number of joint venture properties     30 30     37                            
Cash Distribution     7,300,000                                    
Cash Received From Distributions     7,100,000 7,100,000                                  
Net cash provided by operating activities       14,388,000 29,470,000 22,770,000                       16,400,000      
Net cash used in investing activities       (489,673,000) (133,053,000) (126,916,000)                       24,200,000      
Net cash provided by financing activities       501,369,000 98,818,000 112,554,000                       9,100,000      
Equity Method Investment Preferred Payment     6,500,000 13,000,000                                  
Unaudited other cash distributions     $ 600,000 $ 600,000