Financial Information for Operation Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Community base rental income	$ 106,045	$ 100,776
Resort base rental income	44,949	40,739
Right-to-use annual payments	11,214	11,523
Right-to-use contracts current period, gross	2,923	2,831
Right-to-use contracts current period, deferred	(1,147)	(1,040)
Utility And Other Income	17,571	16,683
Gross revenue from home sales	5,178	2,696
Brokered resale revenues, net	1,799	1,795
Rental home income	3,757	3,394
Total revenues	196,587	183,775
Expenses:
Property operating and maintenance	58,696	55,055
Real estate taxes	12,485	12,400
Sales and marketing, gross	2,405	2,361
Sales and marketing, deferred commissions, net	(555)	(463)
Property management	10,632	10,133
Cost of home sales	5,368	2,781
Home selling expenses	569	527
Rental home operating and maintenance	1,908	1,870
Total expenses	154,584	147,909
Income from operations	42,003	35,866
Property Operations Segment [Member]
Revenues:
Community base rental income	106,045	100,776
Resort base rental income	44,949	40,739
Right-to-use annual payments	11,214	11,523
Right-to-use contracts current period, gross	2,923	2,831
Right-to-use contracts current period, deferred	(1,147)	(1,040)
Utility And Other Income	17,571	16,683
Ancillary services revenues, net	1,504	1,478
Total revenues	183,059	172,990
Expenses:
Property operating and maintenance	58,696	55,055
Real estate taxes	12,485	12,400
Sales and marketing, gross	2,405	2,361
Sales and marketing, deferred commissions, net	(555)	(463)
Property management	10,632	10,133
Total expenses	83,663	79,486
Income from operations	99,396	93,504
Home Sales and Rentals Operations segment
Revenues:
Gross revenue from home sales	5,178	2,696
Brokered resale revenues, net	295	317
Rental home income	3,757	3,394
Total revenues	9,230	6,407
Expenses:
Cost of home sales	5,368	2,781
Home selling expenses	569	527
Rental home operating and maintenance	1,908	1,870
Total expenses	7,845	5,178
Income from operations	$ 1,385	$ 1,229