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Borrowing Arrangements - Additional Information (Detail)
3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
loan
property
Mar. 31, 2019
USD ($)
property
Sep. 30, 2019
USD ($)
Property
Sep. 30, 2018
USD ($)
loan
property
Jan. 23, 2019
property
Dec. 31, 2018
USD ($)
Property
Debt Instrument            
Number of pledged properties | Property     116     118
Pledged assets, not separately reported     $ 2,488,900,000     $ 2,489,800,000
Line of credit outstanding     120,000,000     $ 0
Line of credit remaining borrowing amount     280,000,000.0      
Line of credit potential increase in borrowing capacity     $ 200,000,000.0      
Disposed of by Sale | Manufactured Homes in Indiana and Michigan            
Debt Instrument            
Number of properties sold | property         5  
Mortgage            
Debt Instrument            
Number of loans | loan       1    
Proceeds from loans       $ 64,000,000.0    
Stated interest rate (percentage)       4.80%    
Mortgage | Serendipity            
Debt Instrument            
Weighted average interest rate (percentage)       4.80%    
Proceeds from loans       $ 8,800,000    
Debt assumed for the purchase of property       9,200,000    
Pledged assets, not separately reported       $ 18,000,000.0    
Mortgage | 2019 Asset Acquisition            
Debt Instrument            
Weighted average interest rate (percentage)     5.40%      
Liabilities incurred     $ 18,600,000      
Mortgage premium transferred     $ 600,000      
Mortgage | R V Resort            
Debt Instrument            
Number of pledged properties | property       2    
Mortgage | Prepaid Loans            
Debt Instrument            
Weighted average interest rate (percentage) 6.90%          
Number of loans repaid (loans) | loan 4          
Number of pledged properties | property 4          
Repayments of debt $ 66,800,000          
Payments of prepayment penalties $ 1,400,000          
Mortgage | Prepaid Loans | MH Resort            
Debt Instrument            
Number of pledged properties | property 3          
Mortgage | Prepaid Loans | R V Resort            
Debt Instrument            
Number of pledged properties | property 1          
Mortgage | Disposed of by Sale            
Debt Instrument            
Defeasance of debt   $ 11,200,000        
Weighted average interest rate (percentage)   5.00%        
Mortgage | Disposed of by Sale | Manufactured Homes in Indiana and Michigan            
Debt Instrument            
Number of properties sold | property   5        
Secured Debt            
Debt Instrument            
Weighted average interest rate (percentage)     4.50%      
Secured Debt | Minimum            
Debt Instrument            
Stated interest rate (percentage)     3.50%      
Secured Debt | Maximum            
Debt Instrument            
Stated interest rate (percentage)     8.90%