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Financial Information for Operation Segments (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest                 $ 75,208,000 $ 61,848,000 $ 40,009,000
Revenues:                      
Community Base Rental Income                 409,801,000 394,606,000 309,230,000
Gross revenue from home sales                 17,871,000 8,230,000 6,028,000
Resort base rental income                 147,234,000 134,327,000 130,489,000
Brokered resale revenues, net                 4,212,000 3,093,000 3,483,000
Right-to-use annual payments                 47,967,000 47,662,000 49,122,000
Rental operations revenues                 3,400,000 3,300,000 2,500,000
Right-to-use contracts current period, gross                 13,142,000 13,433,000 17,856,000
Right-to-use contracts current period, deferred                 (5,694,000) (6,694,000) (11,936,000)
Utility income and other                 63,800,000 62,470,000 53,116,000
Expenses:                      
Property operating and maintenance                 229,897,000 220,415,000 197,781,000
Cost of home sales                 17,296,000 9,018,000 5,615,000
Real estate taxes                 48,279,000 45,590,000 36,528,000
Home selling expenses                 2,085,000 1,391,000 1,591,000
Sales and marketing, gross                 12,836,000 10,845,000 11,218,000
Sales and marketing deferred commissions, net                 (2,410,000) (3,155,000) (4,789,000)
Property management                 40,193,000 37,999,000 34,846,000
Total expenses                 653,167,000 621,858,000 537,000,000
Rental home income                 14,267,000 11,649,000 7,245,000
Total revenues 179,881,000 187,966,000 176,753,000 183,775,000 165,312,000 175,064,000 168,383,000 174,947,000 728,375,000 683,706,000 577,009,000
Rental home operating and maintenance                 7,474,000 6,369,000 4,493,000
Property Operations segment
                      
Segment Reporting Information [Line Items]                      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest                 350,524,000 336,037,000 274,945,000
Revenues:                      
Community Base Rental Income                 409,801,000 394,606,000 309,230,000
Resort base rental income                 147,234,000 134,327,000 130,489,000
Right-to-use annual payments                 47,967,000 47,662,000 49,122,000
Right-to-use contracts current period, gross                 13,142,000 13,433,000 17,856,000
Right-to-use contracts current period, deferred                 (5,694,000) (6,694,000) (11,936,000)
Utility income and other                 63,800,000 62,470,000 53,116,000
Ancillary services revenues, net                 3,069,000 1,927,000 2,652,000
Expenses:                      
Property operating and maintenance                 229,897,000 220,415,000 197,781,000
Real estate taxes                 48,279,000 45,590,000 36,528,000
Sales and marketing, gross                 12,836,000 10,845,000 11,218,000
Sales and marketing deferred commissions, net                 (2,410,000) (3,155,000) (4,789,000)
Property management                 40,193,000 37,999,000 34,846,000
Total expenses                 328,795,000 311,694,000 275,584,000
Total revenues                 679,319,000 647,731,000 550,529,000
Home Sales and Rentals Operations segment
                      
Segment Reporting Information [Line Items]                      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest                 6,426,000 4,267,000 2,405,000
Revenues:                      
Gross revenue from home sales                 17,871,000 8,230,000 6,028,000
Brokered resale revenues, net                 1,143,000 1,166,000 831,000
Expenses:                      
Cost of home sales                 17,296,000 9,018,000 5,615,000
Home selling expenses                 2,085,000 1,391,000 1,591,000
Total expenses                 26,855,000 16,778,000 11,699,000
Rental home income                 14,267,000 11,649,000 7,245,000
Total revenues                 33,281,000 21,045,000 14,104,000
Rental home operating and maintenance                 $ 7,474,000 $ 6,369,000 $ 4,493,000