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Reportable Segments - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Segment Reporting Disclosure [Line Items] |  |  |  |  |
Major customers description |  |  | All revenues are from external customers and there is no customer who contributed 10% or more of our total revenues during the quarters or nine months ended September 30, 2013 or 2012. |  |
Segment Reporting Information, Revenue for Reportable Segment | $ 183,881,000 | $ 170,293,000 | $ 536,331,000 | $ 506,552,000 |
Operating Costs and Expenses | (94,229,000) | (85,444,000) | (267,836,000) | (249,095,000) |
Operating Income Loss Before Depreciation And Other | 89,652,000 | 84,849,000 | 268,495,000 | 257,457,000 |
Interest Income | 2,072,000 | 2,006,000 | 5,809,000 | 5,799,000 |
Real Estate Depreciation Expense and Rental Homes | (26,460,000) | (25,579,000) | (81,793,000) | (76,525,000) |
Amortization of Intangible Assets for Continuing Operations | (485,000) | (7,394,000) | (803,000) | (38,659,000) |
Operating Income (Loss) | 64,779,000 | 53,882,000 | 191,708,000 | 148,072,000 |
Net Income (Loss) Available to Common Stockholders, Basic [Abstract] |  |  |  |  |
Corporate Interest Income | 128,000 | 114,000 | 364,000 | 333,000 |
Other Revenues | 1,885,000 | 2,651,000 | 5,989,000 | 5,708,000 |
General and Administrative Expense | (7,606,000) | (6,402,000) | (21,261,000) | (19,317,000) |
Interest Expense, Debt | (29,206,000) | (31,508,000) | (89,706,000) | (93,035,000) |
Payments of Debt Extinguishment Costs | (36,530,000) | 0 | (37,911,000) | 0 |
Rent Control Initiatives Expenses and Other | (521,000) | (221,000) | (2,377,000) | (1,067,000) |
Equity income from unconsolidated joint ventures | 439,000 | 269,000 | 1,624,000 | 1,524,000 |
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax | 982,000 | 2,707,000 | 7,215,000 | 3,226,000 |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax | 40,586,000 | 0 | 41,544,000 | 0 |
Consolidated net income | 34,936,000 | 21,492,000 | 97,189,000 | 45,444,000 |
Total Assets | 3,397,130,000 | 3,497,125,000 | 3,397,130,000 | 3,497,125,000 | 3,398,226,000
Assets of Disposal Group, Including Discontinued Operation | 0 | 118,410,000 | 0 | 118,410,000 | 119,852,000
Capital improvements |  |  | 48,571,000 | 53,164,000 |
Maximum |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |
Number of reportable segments |  |  | 2 |  |
Property Operations Segment [Member] |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment | 174,657,000 | 165,320,000 | 512,587,000 | 491,628,000 |
Operating Costs and Expenses | (86,579,000) | (81,602,000) | (249,148,000) | (237,152,000) |
Operating Income Loss Before Depreciation And Other | 88,078,000 | 83,718,000 | 263,439,000 | 254,476,000 |
Interest Income | 856,000 | 750,000 | 2,589,000 | 2,387,000 |
Real Estate Depreciation Expense and Rental Homes | (24,730,000) | (24,130,000) | (76,704,000) | (72,386,000) |
Amortization of Intangible Assets for Continuing Operations | (485,000) | (7,247,000) | (803,000) | (37,904,000) |
Operating Income (Loss) | 63,719,000 | 53,091,000 | 188,521,000 | 146,573,000 |
Net Income (Loss) Available to Common Stockholders, Basic [Abstract] |  |  |  |  |
Total Assets | 3,099,625,000 |  | 3,099,625,000 |  |
Capital improvements |  |  | 17,787,000 | 21,459,000 |
Home Sales And Rentals [Member] |  |  |  |  |
Segment Reporting Disclosure [Line Items] |  |  |  |  |
Site Rental Income | 9,700,000 | 8,400,000 | 28,900,000 | 23,700,000 |
Segment Reporting Information, Revenue for Reportable Segment | 9,224,000 | 4,973,000 | 23,744,000 | 14,924,000 |
Operating Costs and Expenses | (7,650,000) | (3,842,000) | (18,688,000) | (11,943,000) |
Operating Income Loss Before Depreciation And Other | 1,574,000 | 1,131,000 | 5,056,000 | 2,981,000 |
Interest Income | 1,216,000 | 1,256,000 | 3,220,000 | 3,412,000 |
Real Estate Depreciation Expense and Rental Homes | (1,730,000) | (1,449,000) | (5,089,000) | (4,139,000) |
Amortization of Intangible Assets for Continuing Operations | 0 | (147,000) | 0 | (755,000) |
Operating Income (Loss) | 1,060,000 | 791,000 | 3,187,000 | 1,499,000 |
Net Income (Loss) Available to Common Stockholders, Basic [Abstract] |  |  |  |  |
Total Assets | 297,505,000 |  | 297,505,000 |  |
Capital improvements |  |  | 30,784,000 | 31,705,000 |
Segment, Continuing Operations [Member] |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Basic [Abstract] |  |  |  |  |
Total Assets |  | 3,378,715,000 |  | 3,378,715,000 |
Segment, Continuing Operations [Member] | Property Operations Segment [Member] |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Basic [Abstract] |  |  |  |  |
Total Assets |  | 3,165,456,000 |  | 3,165,456,000 |
Segment, Continuing Operations [Member] | Home Sales And Rentals [Member] |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Basic [Abstract] |  |  |  |  |
Total Assets |  | 213,259,000 |  | 213,259,000 |
Segment, Discontinued Operations [Member] |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Basic [Abstract] |  |  |  |  |
Interest Expense, Debt | $ 95,000 | $ 134,000 | $ 355,000 | $ 400,000 |

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- Definition Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a, b, c -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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Namespace Prefix: | us-gaap_
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Period Type: | duration