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Borrowing Arrangements - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 25, 2015 USD ($) Property | Jun. 30, 2015 USD ($) Property integer Rate | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) Property
Debt Instrument [Line Items] |  |  |  |
Mortgage notes payable |  | $ 1,966,517 |  | $ 2,012,246
Weighted average interest rate | Rate |  | 5.00% |  |
Stated interest rate, minimum | Rate |  | 3.50% |  |
Stated interest rate, maximum | Rate |  | 8.90% |  |
Number of pledged properties | Property |  | 127 |  | 137
Pledged assets, not separately reported |  | $ 2,200,000 |  | $ 2,400,000
New mortgage notes payable financing proceeds |  | 395,323 | $ 54,000 |
Payments of debt extinguishment costs |  | $ 17,000 |  |
Number of loans | integer |  | 2 |  |
Unsecured debt |  | $ 200,000 |  | $ 200,000
Maximum borrowing capacity |  | 400,000 |  |
Additional borrowing capacity |  | $ 100,000 |  |
Expiration date |  | Jul. 17, 2018 |  |
Commitment fee amount |  |  | $ 3,500 |
Line of credit facility potential term extension period |  | 1 year |  |
Old Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rate | 5.58% | 5.73% |  |
Number of pledged properties | Property | 32 |  |  |
Repayments of long-term debt | $ 370,200 | $ 48,700 |  |
New Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rate | 3.93% |  |  |
Number of pledged properties | Property | 26 |  |  |
New mortgage notes payable financing proceeds | $ 395,300 |  |  |
Debt instrument, term |  | 21 years |  |
Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument maturity year |  | 2016 |  |
Interest rate during period | Rate |  | 0.20% |  |
Minimum | Old Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument maturity year |  | 2015 |  |
Minimum | Amended Line Of Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate in addition to LIBOR rate | Rate |  | 1.20% |  |
Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument maturity year |  | 2040 |  |
Interest rate during period | Rate |  | 0.35% |  |
Maximum | Old Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument maturity year |  | 2016 |  |
Maximum | Amended Line Of Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate in addition to LIBOR rate | Rate |  | 1.65% |  |
Term Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured debt |  | $ 200,000 |  |
Maturity date |  | Jan. 10, 2020 |  |
Maturity years |  | 3 years |  |
Term Loans | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate in addition to LIBOR rate | Rate |  | 1.35% |  |
Term Loans | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable rate in addition to LIBOR rate | Rate |  | 1.95% |  |
Manufactured homes | Old Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of pledged properties | Property |  | 1 |  |
R V Resort | Old Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of pledged properties | Property |  | 3 |  |

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