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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 |  |  |

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