Preferred Equity Investments - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended						12 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended		12 Months Ended
	Jan. 02, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Vintage Housing Venture [Member]	Dec. 31, 2013 Vintage Housing Venture [Member]	Dec. 31, 2012 Vintage Housing Venture [Member]	Dec. 31, 2013 Marc Realty [Member]	Dec. 31, 2012 Marc Realty [Member]	Jan. 02, 2012 Marc Realty [Member] Equity Securities, Investment Summary [Member]	Dec. 31, 2011 Marc Realty [Member] Equity Securities, Investment Summary [Member]	Jan. 02, 2012 180 North Michigan [Member] Equity Securities, Investment Summary [Member]	Dec. 21, 2012 WRT-Fenway Wateridge LLC [Member]	Dec. 31, 2013 WRT-Fenway Wateridge LLC [Member]	Dec. 31, 2012 WRT-Fenway Wateridge LLC [Member]	Dec. 31, 2012 VHH LLC [Member]
Schedule of Equity Method Investments [Line Items]
Preferred equity investments		$ 6,485,000	$ 12,250,000										$ 6,000,000	$ 229,000		$ 4,750,000
Priority return from investment													12.00%
Percentage paid from operating cash flow													8.00%
Percentage deferred from investment													4.00%
Distributions received														6,378,000
Percentage acquired in member interest							12.00%									12.00%
Loan Amount							1,500,000
Interest of loan					12.00%
Due Payment					0	0	0
Equity (loss) income		22,641,000	14,843,000	(12,712,000)				(7,971,000)	33,000		338,000			183,000
Loan receivable to an equity investment	2,938,000	(877,000)	2,938,000							2,938,000
Preferred equity investment	$ 3,923,000		$ 3,923,000	$ 7,843,000								$ 3,923,000