Impairment of Real Estate, Impairment of Unconsolidated Entities and Write-Off of Abandoned Development Projects(Detail Textuals) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Impairment of real estate impairment of unconsolidated entities and write off of abandoned development projects [Line Items]
Impairment of unconsolidated entities	$ 0	$ 390,000	$ 0	$ 390,000
Write-off of Abandoned Development Projects	$ 2,696,000	$ 13,212,000	$ 2,777,000	$ 13,659,000