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Borrowing Arrangements - Additional Information (Detail)
3 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Oct. 12, 2016
USD ($)
Property
loan
Jun. 15, 2016
USD ($)
Sep. 30, 2016
USD ($)
Property
Rate
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Property
loan
Rate
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Property
Dec. 31, 2014
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]                  
Deferred financing costs, net     $ 18,800,000   $ 18,800,000   $ 19,700,000    
Mortgage notes payable, net     $ 1,892,692,000   $ 1,892,692,000   $ 1,926,880,000    
Weighted average interest rate (in percentage) | Rate     4.90%   4.90%        
Number of pledged properties | Property     126   126   127    
Pledged assets, not separately reported     $ 2,300,000,000   $ 2,300,000,000   $ 2,200,000,000    
Weighted average maturity (in years)         25 years        
Interest rate at period end (in percentage)     4.05%   4.05%        
New mortgage notes payable financing proceeds         $ 54,450,000 $ 395,323,000      
Early debt retirement     $ 0 $ 0 0 $ 16,922,000      
Unsecured debt     199,327,000   199,327,000   $ 199,172,000    
Maximum borrowing capacity     400,000,000   400,000,000        
Additional borrowing capacity     $ 100,000,000   $ 100,000,000        
Debt instrument, term (in years)         1 year        
Old Credit Facilities                  
Debt Instrument [Line Items]                  
Interest rate at period end (in percentage)     5.83%   5.83%        
Debt repaid         $ 37,000,000        
Number of maturing mortgage loans repaid | loan         4        
Minimum                  
Debt Instrument [Line Items]                  
Interest rate during period (in percentage) | Rate         1.20%        
Line of credit facility, annual fees (in percentage)         0.20%        
Maximum                  
Debt Instrument [Line Items]                  
Interest rate during period (in percentage) | Rate         1.65%        
Line of credit facility, annual fees (in percentage)         0.35%        
Secured Debt | Minimum                  
Debt Instrument [Line Items]                  
Stated interest rate (in percentage)     3.45%   3.45%        
Secured Debt | Maximum                  
Debt Instrument [Line Items]                  
Stated interest rate (in percentage)     8.87%   8.87%        
Line of Credit | Old Credit Facilities                  
Debt Instrument [Line Items]                  
Weighted average interest rate (in percentage)             5.58%    
Debt repaid                 $ 370,200,000
Early debt retirement             $ 17,000,000    
Line of Credit | New Credit Facilities                  
Debt Instrument [Line Items]                  
Weighted average interest rate (in percentage)             3.93%    
Number of pledged properties | Property     32   32   26    
New mortgage notes payable financing proceeds             $ 395,300,000    
Debt instrument maturity year (in years)             21 years    
Term Loans                  
Debt Instrument [Line Items]                  
Unsecured debt     $ 200,000,000   $ 200,000,000   $ 200,000,000    
Maturity date         Jan. 10, 2020        
Term Loans | 2014 Swap                  
Debt Instrument [Line Items]                  
Interest rate at period end (in percentage) | Rate     2.39%   2.39%        
Maturity years (in years)               3 years  
Term Loans | Minimum                  
Debt Instrument [Line Items]                  
Variable rate in addition to LIBOR rate (in percentage) | Rate         1.35%        
Term Loans | Maximum                  
Debt Instrument [Line Items]                  
Variable rate in addition to LIBOR rate (in percentage) | Rate         1.95%        
Manufactured homes                  
Debt Instrument [Line Items]                  
Number of pledged properties towards loans repaid | Property         3        
Manufactured homes | Old Credit Facilities                  
Debt Instrument [Line Items]                  
Number of pledged properties towards loans repaid | Property         3        
R V Resort                  
Debt Instrument [Line Items]                  
Number of pledged properties towards loans repaid | Property         1        
R V Resort | Old Credit Facilities                  
Debt Instrument [Line Items]                  
Number of pledged properties towards loans repaid | Property         1        
Adjustments for New Accounting Pronouncement | Mortgages Notes Payable                  
Debt Instrument [Line Items]                  
Deferred financing costs, net             18,900,000    
Adjustments for New Accounting Pronouncement | Term Loan                  
Debt Instrument [Line Items]                  
Deferred financing costs, net             800,000    
Adjustments for New Accounting Pronouncement | Escrow Deposits, Goodwill and other Assets                  
Debt Instrument [Line Items]                  
Deferred financing costs, net             $ 3,700,000    
Forest Lake Estates | Zephryhills, Florida                  
Debt Instrument [Line Items]                  
Stated interest rate (in percentage)   4.51%              
Loan as direct credit to acquire   $ 22,600,000              
Subsequent Event [Member]                  
Debt Instrument [Line Items]                  
Stated interest rate (in percentage) 3.55%                
Debt repaid $ 15,000,000                
Number of maturing mortgage loans repaid | loan 1                
Debt instrument, term (in years) 20 years                
Subsequent Event [Member] | Manufactured homes                  
Debt Instrument [Line Items]                  
Number of pledged properties towards loans repaid | Property 1