Investment in Joint Ventures - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Equity income from unconsolidated joint ventures	$ 1,899,000	$ 1,948,000	$ 2,027,000
Adjustment Depreciation	1,200,000	1,200,000	1,200,000
Distributions from equity unconsolidated joint ventures	1,839,000	1,841,000	2,831,000
Distributions received that exceeded company's basis in joint venture and recorded in equity in income from unconsolidated joint ventures		$ 100,000