Real Estate and Accumulated Depreciation (Details 1) (USD $)	11 Months Ended	12 Months Ended
	Dec. 31, 2013	Jan. 31, 2013	Jan. 31, 2012
Reconciliations of total real estate carrying value are as follows:
Balance at beginning of period	$ 10,026,010,000	$ 9,646,870,000	$ 11,166,539,000
Additions during period-
Improvements	471,653,000	791,705,000	874,614,000
Other additions, primarily as a result of change in accounting method of property	171,260,000	60,897,000	3,577,000
Other acquisitions	8,514,000	12,587,000	9,201,000
Total additions	651,427,000	865,189,000	887,392,000
Deductions during period-
Cost of real estate sold or retired	(439,130,000)	(370,110,000)	(422,342,000)
Cost of real estate in connection with disposal of partial interests	(1,180,016,000)	0	(404,893,000)
Other deductions, primarily due to impairments and as a result of change in accounting method of property	(582,720,000)	(115,939,000)	(1,579,826,000)
Total deductions	(2,201,866,000)	(486,049,000)	(2,407,061,000)
Balance at end of period	8,475,571,000	10,026,010,000	9,646,870,000
Reconciliations of accumulated depreciation are as follows:
Balance at beginning of period	1,654,632,000	1,526,503,000	1,614,399,000
Additions during period - Charged to profit or loss	255,824,000	204,070,000	181,865,000
Acquisitions, retirements, sales or disposals	(441,128,000)	(75,941,000)	(269,761,000)
Balance at end of period	$ 1,469,328,000	$ 1,654,632,000	$ 1,526,503,000