Investments in Partially Owned Entities (LNR) (Details) (USD $)	1 Months Ended	3 Months Ended			6 Months Ended	12 Months Ended
	Jan. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Apr. 19, 2013	Apr. 19, 2013	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Sep. 30, 2013
Activities Related To Investment In Lnr Roll Forward [Abstract]
Balance at beginning of period	$ 1,704,297,000		$ 1,704,297,000	$ 1,704,297,000		$ 1,704,297,000	$ 1,740,459,000
Equity in earnings of LNR						(338,785,000)	423,126,000		118,612,000
Other comprehensive loss						(22,814,000)	(31,758,000)		12,859,000
Proceeds from the sale of LNR						(240,474,000)	0		0
Balance at end of period						1,249,667,000	1,704,297,000		1,740,459,000
Condensed Financial Information For Equity Method Investments [Abstract]
Assets						21,773,000,000	122,692,000,000
Liabilities						17,982,000,000	117,064,000,000
Noncontrolling interests						96,000,000	88,000,000
Equity						3,695,000,000	5,540,000,000
Total revenue						14,092,000,000	15,119,000,000		15,321,000,000
Net (loss) income attributable to investee						(368,000,000)	1,091,000,000		199,000,000
LNR [Member]
Schedule Of Equity Method Investments [Line Items]
Sales Of Real Estate	1,053,000,000
Activities Related To Investment In Lnr Roll Forward [Abstract]
Balance at beginning of period	224,724,000	241,377,000	224,724,000	224,724,000		224,724,000
Equity in earnings of LNR		(3,776,000)		(21,131,000)		18,731,000	66,270,000		58,786,000
Other comprehensive loss		(903,000)	(2,078,000)			(2,981,000)
Balance before impairment loss		236,698,000	268,608,000			263,929,000
Impairment loss		0	(27,231,000)	66,241,000		(27,231,000)
Proceeds from the sale of LNR	(240,474,000)	(240,474,000)	0			(240,474,000)
Balance at end of period		0	241,377,000			0	224,724,000
Condensed Financial Information For Equity Method Investments [Abstract]
Assets								98,530,000,000			0
Liabilities								97,643,000,000			0
Noncontrolling interests								8,000,000			0
Equity								879,000,000			0
Total revenue					122,222,000			238,000,000		208,000,000
Net (loss) income attributable to investee				(80,654,000)	94,949,000			266,000,000		224,000,000
LNR [Member] | Vornado Realty Trust [Member]
Activities Related To Investment In Lnr Roll Forward [Abstract]
Impairment loss				17,355,000
LNR [Member] | Income Before Income Taxes And Impairments [Member]
Activities Related To Investment In Lnr Roll Forward [Abstract]
Equity in earnings of LNR		$ (3,776,000)	$ 45,962,000			$ 42,186,000