Commitments and Contingencies - Additional Information (Detail) (USD $)		12 Months Ended		12 Months Ended			12 Months Ended		6 Months Ended	1 Months Ended
	Aug. 06, 2012	Dec. 31, 2010 Colony Park [Member]	Dec. 31, 2010 Colony Park [Member] Maximum	Dec. 31, 2011 Membership Class Action	Dec. 31, 2010 Hurricane Claim Litigation	Jun. 22, 2007 Hurricane Claim Litigation	Dec. 31, 2012 Morgan RV Resorts [Domain] integer	Dec. 31, 2010 Attorney Fees [Member] Colony Park [Member]	Jun. 30, 2009 Attorney Fees [Member] California Rent Control Litigation Final Resolution in Favor of Company	Apr. 30, 2013 Subsequent Event [Member] Attorney Fees [Member] San Rafael [Member] [Member]
Loss Contingencies [Line Items]
Award for costs and attorney fee claimed								$ 2,000,000	$ 2,100,000	$ 1,250,000
Expiration period of Ordinance from June 30, 2009 date of judgment									10 years
Loss award claimed by plaintiffs		6,800,000
Loss awarded to plaintiffs			44,000
Number of plaintiff		72		2
Number of plaintiff the jury rendered verdicts		6
Number of plaintiffs dismissed		66
Loss Contingency Claims Dismissed And Not Appealed Number		3
Claims filed against Aon						11,000,000
Proceeds from insurance					7,400,000
Loss Contingency, Estimate of Possible Loss	$ 2,400,000
Number of Intended Purchase Properties							15
Number of Acquisition Properties Contested							11
Number of Contested Properties Closed							10