Debt - Additional Information (Detail) (USD $)	12 Months Ended						12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2007 Defeased Debt	Dec. 31, 2012 Defeased Debt	Dec. 31, 2011 Defeased Debt	Dec. 31, 2012 Total Outstanding Cdd Debt	Dec. 31, 2011 Total Outstanding Cdd Debt	Dec. 31, 2012 Community Development District Debt
Debt Disclosure [Line Items]
Total community development district debt	$ 9,200,000		$ 30,200,000				$ 34,800,000	$ 56,800,000
Prepayment of community development district assessment obligations									19,900,000
Long term debt	$ 36,062,000	[1]	$ 53,458,000	$ 29,300,000	$ 26,818,000	$ 23,299,000
Long term debt, year of balloon payment				2015

[1] Includes debt defeased in connection with the sale of the Company's office portfolio in the amount of $26.8 million.