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Borrowing Arrangements - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended |  |  |
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Sep. 30, 2013 integer Rate | Sep. 30, 2012 | Sep. 30, 2013 Rate integer | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Old Credit Facilities [Member] | Jul. 31, 2012 Amended Line of Credit Facility | Sep. 30, 2013 New Credit Facilities [Member] | Sep. 30, 2013 Minimum | Jul. 31, 2012 Minimum Amended Line of Credit Facility Rate | Sep. 30, 2013 Maximum | Jul. 31, 2012 Maximum Amended Line of Credit Facility Rate | Sep. 30, 2013 Term Loans | Sep. 30, 2013 Term Loans Minimum Rate | Sep. 30, 2013 Term Loans Maximum Rate | Jul. 30, 2013 Manufactured Home [Member] Old Credit Facilities [Member] | Sep. 30, 2013 Manufactured Home [Member] Old Credit Facilities [Member] | Jul. 18, 2013 Manufactured Home [Member] Old Credit Facilities [Member] | Sep. 30, 2013 Manufactured Home [Member] Minimum Old Credit Facilities [Member] | Sep. 30, 2013 Manufactured Home [Member] Maximum Old Credit Facilities [Member] | Sep. 30, 2013 Segment, Discontinued Operations [Member] | Dec. 31, 2012 Segment, Discontinued Operations [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | $ 200,000,000 |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2017 |  |  |  |  |  |  |  |  |
Mortgage notes payable | 1,994,308,000 |  | 1,994,308,000 |  | 2,061,610,000 |  |  | 347,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,300,000
Debt Instrument, Unamortized Premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |
Debt, Weighted Average Interest Rate | 5.10% |  | 5.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, minimum interest rate |  |  | 3.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maximum interest rate |  |  | 8.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity year |  |  |  |  |  |  |  |  | 2014 |  | 2038 |  |  |  |  |  |  | 2020 | 2014 | 2015 |  |
Extinguishment of Debt, Amount | 36,530,000 | 0 | 37,911,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pledge properties | 152 |  | 152 |  | 170 | 9 |  |  |  |  |  |  |  |  |  |  | 29 | 1 |  |  |  |
Carrying values of properties encumbered | 2,390,000,000 |  | 2,390,000,000 |  | 2,485,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  |  | 73,700,000 |  |  |  |  |  |  |  |  |  | 7,900,000 | 312,200,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.00% |  | 4.50% |  |  |  |  |  |  |  |  | 5.70% | 7.20% |  |  |  |
Debt instrument, interest rate based on margin over LIBOR |  |  |  |  |  |  |  |  |  | 1.40% |  | 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% |  |  |  |  |  |  |  |  |
Derivative, Maturity Years |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Lines of credit, borrowing capacity | 380,000,000 |  | 380,000,000 |  | 380,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Lines of Credit |  |  | 20,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lines of credit, maturity date |  |  |  |  |  |  | Sep. 15, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate based on margin over LIBOR |  |  | Our amended LOC bears a LIBOR rate plus a maximum of 1.40% to 2.00%, contains a 0.25% to 0.40% facility rate and has a maturity date of September 15, 2016. We have a one year extension option under our LOC. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Lines of Credit |  |  | 20,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lines of credit, extension option |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Amount |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, facility rate |  |  |  |  |  |  |  |  |  | 0.25% |  | 0.40% |  |  |  |  |  |  |  |  |  |

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- Definition The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B6 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
Name: | us-gaap_UnsecuredDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant