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Net Gain on Disposition of Partial Interests in Rental Properties and Other Investment (Tables)
 6 Months Ended
Jul. 31, 2011
Net Gain On Disposition Of Partial Interests In Rental Properties And Other Investment (Tables) [Abstract]  
Net gain on disposition of partial interests in rental properties and other investment
The net gain on disposition of partial interests in rental properties and other investment is comprised of the following:
                                 
    Three Months Ended July 31,     Six Months Ended July 31,  
    2011   2010     2011   2010  
            (in thousands)          
New York Retail Joint Venture
  $ -     $ -     $ 9,561     $ -  
University Park Joint Venture
    -       204,269       -       175,793  
The Nets
    -       55,112       -       55,112  
Bernstein Joint Venture
    -       -       -       29,342  
 
                   
 
  $ -     $ 259,381     $ 9,561     $ 260,247