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Investment in Real Estate - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 1 Months Ended |  | 9 Months Ended |  |  |
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Jul. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Oct. 01, 2013 | Jul. 18, 2013 | Apr. 02, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Sep. 30, 2013 Purchase Price Allocation Adjustments | Sep. 30, 2013 Cascade [Member] | Sep. 30, 2013 Segment, Discontinued Operations [Member] | Sep. 30, 2012 Segment, Discontinued Operations [Member] | Sep. 30, 2013 Segment, Discontinued Operations [Member] | Sep. 30, 2012 Segment, Discontinued Operations [Member] | Dec. 31, 2012 Segment, Discontinued Operations [Member] | Sep. 30, 2013 R V Resort [Member] | Sep. 16, 2013 R V Resort [Member] | Sep. 30, 2013 Manufactured Home [Member] | Aug. 01, 2013 Manufactured Home [Member] | May 08, 2013 Manufactured Home [Member] | Sep. 30, 2013 Land [Member] | Sep. 30, 2013 Depreciable Assets [Member] | Sep. 30, 2013 Homesite [Member] | Sep. 30, 2013 Leases, Acquired-in-Place [Member]
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,232,000 | $ 82,333,000 | $ 1,155,000 | $ 3,910,000
Real Estate Investment Property, Net |  | 3,177,174,000 |  | 3,177,174,000 |  |  |  |  | 3,096,069,000 |  |  |  |  |  |  |  | 111,800,000 |  |  |  |  |  |  |  |  |
Depreciation Expense Adjustment |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition price adjustments period |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  | 40,586,000 | 0 | 41,544,000 | 0 |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Location Of Real Estate Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Fiesta Key RV Resort |  |  |  |  |  |  |  |
Number of manufactured home communities acquired | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Acquired Sites |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 324 |  | 1,207 |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,600,000 |  | 102,000,000 |  |  |  |  |
Ground Lease Escrow Shares |  | 167,400 |  | 167,400 |  |  |  |  |  | 227,586 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow Share Distribution |  |  |  |  |  | 30,619 | 30,268 | 29,918 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value of Escrow Fund |  | 4,500,000 |  | 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Properties Disposed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |
Number of Sites Disposed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,344 |  |  |  |  |  |
Purchase Price For Disposed Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 165,000,000 |  |  |  |
Gain (Loss) on Disposition of Real Estate, Discontinued Operations |  | 40,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  | 1,023,456,000 |  | 1,023,456,000 |  |  |  |  | 984,224,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buildings and Improvements, Gross |  | 530,701,000 |  | 530,701,000 |  |  |  |  | 495,127,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Property, Accumulated Depreciation |  | 1,031,152,000 |  | 1,031,152,000 |  |  |  |  | 948,581,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Assets |  | 70,744,000 |  | 70,744,000 |  |  |  |  | 47,829,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of Disposal Group, Including Discontinued Operation |  | 0 | 118,410,000 | 0 | 118,410,000 |  |  |  | 119,852,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt |  | 1,994,308,000 |  | 1,994,308,000 |  |  |  |  | 2,061,610,000 |  |  |  |  |  |  |  | 8,300,000 |  |  |  |  |  |  |  |  |
Liabilities of Disposal Group, Including Discontinued Operation |  | 0 |  | 0 |  |  |  |  | 10,058,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  | 400,000 |  |  |  |  |  |  |  |  |  |  |
Community Base Rental Income |  | 103,157,000 | 98,752,000 | 305,401,000 | 295,185,000 |  |  |  |  |  |  |  | 1,448,000 | 4,915,000 | 11,565,000 | 14,633,000 |  |  |  |  |  |  |  |  |  |
Rental Home Income |  | 3,584,000 | 3,055,000 | 10,576,000 | 8,422,000 |  |  |  |  |  |  |  | 328,000 | 656,000 | 1,948,000 | 1,690,000 |  |  |  |  |  |  |  |  |  |
Utility And Other Income |  | 16,224,000 | 15,499,000 | 48,694,000 | 48,559,000 |  |  |  |  |  |  |  | 378,000 | 536,000 | 1,375,000 | 1,460,000 |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 2,154,000 | 6,107,000 | 14,888,000 | 17,783,000 |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Operating Expense |  |  |  |  |  |  |  |  |  |  |  |  | 1,116,000 | 2,552,000 | 6,039,000 | 7,018,000 |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  | 1,038,000 | 3,555,000 | 8,849,000 | 10,765,000 |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Sales of Other Real Estate |  |  |  |  |  |  |  |  |  |  |  |  | 2,000 | (42,000) | (77,000) | (83,000) |  |  |  |  |  |  |  |  |  |
Disposal Group Including Discontinued Operation Other Income and Expenses |  |  |  |  |  |  |  |  |  |  |  |  | 37,000 | (672,000) | (1,202,000) | (7,056,000) |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt |  | 29,206,000 | 31,508,000 | 89,706,000 | 93,035,000 |  |  |  |  |  |  |  | (95,000) | (134,000) | (355,000) | (400,000) |  |  |  |  |  |  |  |  |  |
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest |  | 41,568,000 | 2,707,000 | 48,759,000 | 3,226,000 |  |  |  |  |  |  |  | 982,000 | 2,707,000 | 7,215,000 | 3,226,000 |  |  |  |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Assets Acquired |  | $ 126,630,000 |  | $ 126,630,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 14 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 13 -Subparagraph g -Chapter V -Subsection II -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. + Details
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