Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Total debt	$ 30,378	[1]	$ 53,458
Defeased Debt
Debt Instrument [Line Items]
Defeased debt, secured and paid by pledged treasury securities	21,690		23,299
Debt
Debt Instrument [Line Items]
Community Development District debt	$ 8,688		$ 30,159

[1] Includes debt defeased in connection with the sale of the Company's office portfolio in the amount of $21.7 million.