Gain (Loss) on Extinguishment of Debt (Details Textuals) (USD $)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Extinguishment of Debt [Line Items]
Gain (loss) on extinguishment of debt	$ 7,096,000	$ 9,590,000	$ (21,035,000)
Terminal Tower [Member]
Extinguishment of Debt [Line Items]
Gain (loss) on extinguishment of debt	9,425,000
Defaulted nonrecourse mortgage [Member]
Extinguishment of Debt [Line Items]
Carrying value of nonrecourse mortgage		73,500,000
Restricted cash applied to outstanding principal balance	12,300,000
Outstanding principal balance, forbearance agreement	40,000,000
Forbearance period	2 years
Interest Rate, forbearance agreement	9.00%
Participation payment percentage, forbearance agreement	50.00%
Mixed-use development in Las Vegas, Nevada [Member]
Extinguishment of Debt [Line Items]
Gain (loss) on extinguishment of debt		15,101,000
Avenue at Tower City Center [Member]
Extinguishment of Debt [Line Items]
Gain (loss) on extinguishment of debt		5,329,000
Botanica on the Green and Crescent Flats [Member]
Extinguishment of Debt [Line Items]
Gain (loss) on extinguishment of debt			2,472,000
2011, 2015 and 2017 Senior Notes [Member]
Extinguishment of Debt [Line Items]
Gain Loss On Exchange Of Notes For Shares			6,297,000
2011 and 2017 Senior Notes [Member]
Extinguishment of Debt [Line Items]
Gain (loss) on extinguishment of debt			1,896,000
Senior Notes [Member] | Convertible Senior Notes due 2016 [Member]
Extinguishment of Debt [Line Items]
Gain (loss) on extinguishment of debt		$ (10,800,000)	$ (31,689,000)