Reportable Segments - Income from Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Other income	$ 14,185	$ 9,680	$ 24,706	$ 20,739
Total revenues	317,423	254,090	613,467	534,566
Expenses:
Real estate taxes	17,896	16,668	35,746	33,509
Sales and marketing, gross	6,298	4,276	12,474	8,254
Membership sales commissions, deferred, net	(1,438)	(481)	(2,937)	(697)
Total expenses	254,411	206,301	482,277	416,260
Income before equity in income of unconsolidated joint ventures	63,012	47,789	131,131	118,306
Property Operations
Revenues:
Rental income	251,420	213,885	496,149	449,249
Other income	14,185	9,680	24,706	20,739
Total revenues	285,378	238,155	558,933	500,629
Expenses:
Operating and maintenance expenses	101,351	84,020	188,981	166,311
Real estate taxes	17,896	16,668	35,746	33,509
Sales and marketing, gross	6,298	4,276	12,474	8,254
Membership sales commissions, deferred, net	(1,438)	(481)	(2,937)	(697)
Total expenses	140,667	119,296	266,204	237,194
Income before equity in income of unconsolidated joint ventures	144,711	118,859	292,729	263,435
Home Sales and Rentals Operations
Revenues:
Rental income	4,278	4,078	8,571	8,060
Total revenues	29,081	13,122	48,867	28,674
Expenses:
Operating and maintenance expenses	1,312	1,245	2,555	2,588
Home selling expenses	1,346	1,081	2,652	2,294
Total expenses	26,514	11,176	43,931	25,643
Income before equity in income of unconsolidated joint ventures	2,567	1,946	4,936	3,031
Annual membership subscriptions
Revenues:
Contract revenue	14,267	12,961	27,921	26,034
Annual membership subscriptions | Property Operations
Revenues:
Contract revenue	14,267	12,961	27,921	26,034
Membership upgrade sales current period, gross
Revenues:
Contract revenue	9,207	5,048	19,221	9,891
Membership upgrade sales current period, gross | Property Operations
Revenues:
Contract revenue	9,207	5,048	19,221	9,891
Membership upgrade sales upfront payments, deferred, net
Revenues:
Contract revenue	(6,454)	(2,666)	(13,881)	(5,208)
Membership upgrade sales upfront payments, deferred, net | Property Operations
Revenues:
Contract revenue	(6,454)	(2,666)	(13,881)	(5,208)
Gross revenues from home sales
Revenues:
Contract revenue	24,427	8,866	39,647	20,175
Expenses:
Property management and cost of home sales	23,856	8,850	38,724	20,761
Gross revenues from home sales | Home Sales and Rentals Operations
Revenues:
Contract revenue	24,427	8,866	39,647	20,175
Expenses:
Property management and cost of home sales	23,856	8,850	38,724	20,761
Brokered resale revenues, net | Home Sales and Rentals Operations
Revenues:
Contract revenue	376	178	649	439
Ancillary services revenues, net | Property Operations
Revenues:
Contract revenue	2,753	(753)	4,817	(76)
Ancillary services revenues, net | Home Sales and Rentals Operations
Revenues:
Contract revenue	0	0	0	0
Property management
Expenses:
Property management and cost of home sales	16,560	14,813	31,940	29,817
Property management | Property Operations
Expenses:
Property management and cost of home sales	$ 16,560	$ 14,813	$ 31,940	$ 29,817