Mortgage Debt and Notes Payable, Nonrecourse (Details) (USD $)																											11 Months Ended
	Dec. 31, 2013	Jan. 31, 2013	Dec. 31, 2013 Operating Properties [Member]	Jan. 31, 2013 Operating Properties [Member]	Dec. 31, 2013 Development Projects [Member]	Jan. 31, 2013 Development and Land Projects [Member]	Dec. 31, 2013 Fixed Rate Debt [Member]		Jan. 31, 2013 Fixed Rate Debt [Member]	Dec. 31, 2013 Fixed Rate Debt [Member] Operating Properties [Member]	Jan. 31, 2013 Fixed Rate Debt [Member] Operating Properties [Member]	Dec. 31, 2013 Fixed Rate Debt [Member] Development Projects [Member]		Jan. 31, 2013 Fixed Rate Debt [Member] Development and Land Projects [Member]	Dec. 31, 2013 Variable Rate Debt, Taxable [Member]	Jan. 31, 2013 Variable Rate Debt, Taxable [Member]	Dec. 31, 2013 Variable Rate Debt, Taxable [Member] Operating Properties [Member]	Jan. 31, 2013 Variable Rate Debt, Taxable [Member] Operating Properties [Member]	Dec. 31, 2013 Variable Rate Debt, Taxable [Member] Development Projects [Member]	Jan. 31, 2013 Variable Rate Debt, Taxable [Member] Development and Land Projects [Member]	Dec. 31, 2013 Variable Rate Debt, Tax-Exempt [Member]	Jan. 31, 2013 Variable Rate Debt, Tax-Exempt [Member]	Dec. 31, 2013 Variable Rate Debt, Tax-Exempt [Member] Operating Properties [Member]	Jan. 31, 2013 Variable Rate Debt, Tax-Exempt [Member] Operating Properties [Member]	Dec. 31, 2013 Variable Rate Debt, Tax-Exempt [Member] Development Projects [Member]	Jan. 31, 2013 Variable Rate Debt, Tax-Exempt [Member] Development and Land Projects [Member]	Dec. 31, 2013 Nonrecourse Mortgage Debt [Member] Development project held for sale [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage debt and notes payable, nonrecourse	$ 4,579,506,000	$ 5,740,660,000	$ 4,179,669,000	$ 5,313,869,000	$ 399,837,000	$ 426,791,000	$ 2,581,337,000	[1]	$ 3,758,144,000	$ 2,286,555,000	$ 3,456,879,000	$ 294,782,000	[1]	$ 301,265,000	$ 1,432,725,000	$ 1,510,930,000	$ 1,381,225,000	$ 1,448,205,000	$ 51,500,000	$ 62,725,000	$ 565,444,000	$ 471,586,000	$ 511,889,000	$ 408,785,000	$ 53,555,000	$ 62,801,000
Total weighted average rate	4.66%	5.04%					5.28%	[1]	5.51%						4.81%	4.93%					1.47%	1.64%
Mortgage debt nonrecourse of development project held for sale	$ 228,000,000	$ 0
Interest Rate																											2.50%
Derivative, Maturity Date																											May 01, 2017

[1] Includes $228,000 of mortgage debt, nonrecourse of development project held for sale, which bears interest at 2.5% and matures in May 2017