Accounting Policies (Details Textual 1) (USD $)	6 Months Ended	11 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Maximum loss exposure for unconsolidated variable interest entities	$ 217,000,000
Fair value of consideration exchanged or accrued in excess of book value	56,073,000	98,687,000
Pacific Park Brooklyn [Member]
Variable Interest Entity [Line Items]
Area of project in acres	22
Decrease in development project held for sale due to deconsolidation of the VIE	504,171,000
Decrease in cash and equivalents due to deconsolidation of the VIE	1,141,000
Decrease in restricted cash due to deconsolidation of the VIE	99,784,000
Decrease in other assets due to deconsolidation of the VIE	2,571,000
Decrease in nonrecourse mortgage debt due to deconsolidation of the VIE	228,000,000
Decrease in accounts payable, accrued expenses and other liabilities due to deconsolidation of the VIE	20,428,000
Increase in investments in and advances to unconsolidated entities due to deconsolidation of the VIE	156,071,000
Primary beneficiary [Member]
Variable Interest Entity [Line Items]
Number of variable interest entities	28
Number of properties represented by variable interest entities	21
Not primary beneficiary [Member]
Variable Interest Entity [Line Items]
Number of variable interest entities	62
Additional Paid-in Capital [Member]
Variable Interest Entity [Line Items]
Fair value of consideration exchanged or accrued in excess of book value	$ 53,351,000	$ 95,924,000