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Borrowing Arrangements - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Rate
integer
Sep. 30, 2011
Dec. 31, 2011
Rate
Jul. 20, 2012
Sep. 30, 2012
OriginalLineOfCreditFacitlity [Member]
Jul. 31, 2012
Amended Line of Credit Facility
Sep. 30, 2012
Old Credit Facilities
Sep. 30, 2012
Minimum
Dec. 31, 2011
Minimum
Sep. 30, 2012
Minimum
OriginalLineOfCreditFacitlity [Member]
Rate
Jul. 31, 2012
Minimum
Amended Line of Credit Facility
Rate
Sep. 30, 2012
Maximum
Dec. 31, 2011
Maximum
Sep. 30, 2012
Maximum
OriginalLineOfCreditFacitlity [Member]
Rate
Jul. 31, 2012
Maximum
Amended Line of Credit Facility
Rate
Sep. 30, 2012
Term Loans
Rate
Sep. 30, 2012
Term Loans
Minimum
Rate
Sep. 30, 2012
Term Loans
Maximum
Rate
Sep. 30, 2012
Manufactured Home [Member]
New Credit Facilities [Member]
Sep. 30, 2012
Manufactured Home [Member]
Old Credit Facilities
Sep. 30, 2012
Recreational Vehicle Resort [Member]
Sep. 30, 2012
Recreational Vehicle Resort [Member]
New Credit Facilities [Member]
Sep. 30, 2012
Recreational Vehicle Resort [Member]
Old Credit Facilities
Debt Instrument [Line Items]                                                  
Mortgage notes payable $ 2,084,203,000   $ 2,084,203,000   $ 2,084,683,000                                        
Mortgage notes payable, weighted average interest rate 5.50%   5.50%           5.70%                             5.10% 5.40%
Debt, minimum interest rate     3.90%   4.65%                                        
Debt, maximum interest rate     8.90%   8.87%                                        
Debt, maturity year                   2013 2012     2023 2023           2022     2022  
Number of pledge properties 172   172   174       2                       1   2    
Debt Instrument, Interest Rate, Stated Percentage                                         3.90% 5.70%      
Carrying values of properties encumbered 2,503,267,000   2,503,267,000   2,577,845,000                                        
Proceeds from Issuance of Long-term Debt   200,000,000 159,500,000 200,000,000                                 74,000,000     85,500,000  
Debt, maturity date                                   Jun. 30, 2017       May 01, 2013     Jun. 01, 2014
Repayments of Long-term Debt                 34,100,000                         35,100,000     63,300,000
Debt instrument face amount                                   200,000,000              
Debt, extension option period                                   1 year              
Debt instrument, interest rate based on margin over LIBOR                       1.65% 1.40%     2.50% 2.00%   1.85% 2.80%          
Start date to repay debt without penalty on prepayment                                   Jul. 01, 2014              
Debt, percentage of prepayment penalty                                   2.00%              
LIBOR Swap Agreement, period                                   3 years              
Lines of credit, borrowing capacity 380,000,000   380,000,000   380,000,000                                        
Lines of credit, maturity date             Sep. 18, 2015 Sep. 15, 2016                                  
Line of credit facility, interest rate based on margin over LIBOR    
the Company amended its LOC to (i) decrease the per annum interest rate to LIBOR plus a maximum of 1.40% to 2.00%, bearing a facility rate of 0.25% to 0.40%, (ii) extend the maturity of the LOC to September 15, 2016, (iii) lengthen the extension option to one year and (iv) effect other ministerial changes.
                                            
Line of credit, facility fee                       0.30%       0.40%                  
Lines of credit, extension option             0 years 8 months 1 year                                  
Line of Credit Facility, Commitment Fee Amount $ 1,300,000                                                
Line of Credit, amended date           Jul. 20, 2012                                      
Line of credit, facility rate                         0.25%       0.40%