Investments in Unconsolidated Joint Ventures (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2011 Property Year Location		Jun. 30, 2010	Jun. 30, 2011 MortgageLoan Property Year Location		Jun. 30, 2010	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Number of Sites	3,075			3,075
Investment in joint ventures	$ 8,322			$ 8,322			$ 8,446
Equity in income of unconsolidated joint ventures	541		559	1,325		1,400
Voyager Investments | Arizona
Schedule of Equity Method Investments [Line Items]
Number of Sites	1,706			1,706
Economic Interest	50.00%	[1],[2]		50.00%	[1],[2]
Investment in joint ventures	7,962			7,962			8,055
Equity in income of unconsolidated joint ventures				712		750
Meadows Investments | Various
Schedule of Equity Method Investments [Line Items]
Number of Sites	1,027			1,027
Economic Interest	50.00%	[1]		50.00%	[1]
Investment in joint ventures	235			235			276
Equity in income of unconsolidated joint ventures				486		521
Lakeshore Investments | Florida
Schedule of Equity Method Investments [Line Items]
Number of Sites	342			342
Economic Interest	65.00%	[1]		65.00%	[1]
Investment in joint ventures	125			125			115
Equity in income of unconsolidated joint ventures				$ 127		$ 129

[1] The percentages shown approximate the Company's economic interest as of June 30, 2011. The Company's legal ownership interest may differ.

[2] Voyager joint venture primarily consists of a 50% interest in Voyager RV Resort and a 25% interest in the utility plant servicing the Property.