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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 |  |  |  |  |  |  |  |

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