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Investment in Real Estate - Additional Information (Detail) (USD $)
 3 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Apr. 02, 2013
Dec. 31, 2012
Dec. 31, 2011
integer
Mar. 31, 2013
Purchase Price Allocation Adjustments
Dec. 31, 2012
Victoria Palms [Member]
Dec. 31, 2012
Alamo Palms [Member]
Dec. 31, 2011
Manufactured Home [Member]
Dec. 31, 2011
R V Resort [Member]
Real Estate Properties [Line Items]                    
Asset acquisition price adjustments period           1 year        
Number of acquired sites             1,122 643    
Purchase price to acquire properties       $ 25,000,000            
Document Period End Date Mar. 31, 2013                  
Number Of Closed Acquisition Properties                 74 1
Fee Interest And Leasehold Interest Property         1          
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax 958,000 0                
Ground Lease Escrow Shares   113,793 98,834              
Fair Value of Escrow Fund 7,700,000                  
Increase (Decrease) in Fair Value of Escrow Fund Shares $ 1,000,000                  
Escrow Share Distribution     14,959