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Investment in Real Estate - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
site
Dec. 31, 2016
USD ($)
property
site
Dec. 31, 2015
USD ($)
site
Real Estate Properties [Line Items]      
Number of properties acquired | property   4  
Number of sites acquired | site 1,870 2,377  
Purchase price of the property $ 142,400 $ 120,500  
Long-term Debt 2,200,017    
Mortgage debt assumed 5,900 22,600  
Unamortized discount (premium) 3,253    
R V Resort      
Real Estate Properties [Line Items]      
Number of sites acquired | site     731
Purchase price of the property     $ 23,900
Paradise Park Largo      
Real Estate Properties [Line Items]      
Debt assumed for the purchase of property $ 5,900    
Forest Lake Estates | Zephryhills, Florida      
Real Estate Properties [Line Items]      
Debt assumed for the purchase of property   $ 22,600