Investment in Joint Ventures - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Schedule of Equity Method Investments [Line Items]
Equity income from unconsolidated joint venture	$ 541,000	$ 559,000	$ 1,325,000	$ 1,400,000
Depreciation Expense			600,000	600,000
Distribution from equity unconsolidated joint ventures			1,332,000	829,000
Distribution received that exceeded company's basis in joint venture and recorded in equity in income from unconsolidated joint ventures			$ 100,000	$ 200,000