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Borrowing Arrangements - Additional Information (Detail) | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 USD ($) Property loan Rate | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) Property | Mar. 31, 2016 USD ($) Property Rate
Debt Instrument [Line Items] |  |  |  |
Deferred financing costs, net | $ 19,000,000 |  | $ 19,700,000 | $ 19,000,000
Mortgage notes payable | $ 1,907,074,000 |  | $ 1,926,880,000 | $ 1,907,074,000
Weighted average interest rate | Rate | 4.90% |  |  | 4.90%
Stated interest rate | 5.48% |  |  | 5.48%
Number of pledged properties | Property | 126 |  | 127 | 126
Pledged assets, not separately reported | $ 2,200,000,000 |  | $ 2,200,000,000 | $ 2,200,000,000
New mortgage notes payable financing proceeds | 0 | $ 395,323,000 |  |
Unsecured debt | 199,224,000 |  | $ 199,172,000 | 199,224,000
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] |  |  |  |
Number of maturing mortgage loans repaid | loan | 1 |  |  |
Debt repaid | $ 9,800,000 |  |  |
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 [Member] | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.45% |  |  | 3.45%
Secured Debt [Member] | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 8.87% |  |  | 8.87%
Line of Credit [Member] | Old Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rate |  |  | 5.58% |
Loss on extinguishment of debt |  |  | $ 17,000,000 |
Debt repaid |  |  |  | $ 370,200,000
Line of Credit [Member] | New Credit Facilities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rate |  |  | 3.93% |
Debt instrument maturity year |  |  | 21 years |
Number of pledged properties | Property |  |  | 26 |
New mortgage notes payable financing proceeds |  |  | $ 395,300,000 |
Term Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured debt | $ 200,000,000 |  |  | 200,000,000
Maturity date | Jan. 10, 2020 |  |  |
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 | 1 |  |  |
Adjustments for New Accounting Pronouncement | Mortgages Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Deferred financing costs, net | $ 18,200,000 |  | 18,900,000 | 18,200,000
Adjustments for New Accounting Pronouncement | Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Deferred financing costs, net | 800,000 |  | 800,000 | 800,000
Adjustments for New Accounting Pronouncement | Escrow Deposits, Goodwill and other Assets |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Deferred financing costs, net | $ 3,400,000 |  | $ 3,700,000 | $ 3,400,000

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