Investment in Real Estate - Net Non-Cash Impairment Charges (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Impairment Charges [Line Items]
Total Net Impairment	$ 2,652	$ 1,246	$ (2,661)
Operating Properties-Held for Sale and Sold Assets [Member]
Impairment Charges [Line Items]
Total Net Impairment	1,605	1,438	6,214
Impairment-Discontinued Operations [Member]
Impairment Charges [Line Items]
Total Net Impairment	1,605	1,438	6,214
Land Parcels Sold Assets [Member]
Impairment Charges [Line Items]
Total Net Impairment	0	0	(5,918)
Operating Properties Not Held for Sale [Member]
Impairment Charges [Line Items]
Total Net Impairment	1,047	(192)	(1,755)
Land Parcels Not Held for Sale [Member]
Impairment Charges [Line Items]
Total Net Impairment	0	0	(1,202)
Impairment - Continuing Operations [Member]
Impairment Charges [Line Items]
Total Net Impairment	$ 1,047	$ (192)	$ (8,875)