Real Estate Acquisitions, Schedule of Business Acquisitions, by Acquisition (Details)	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2020 shares	Mar. 31, 2021 USD ($) community	Jun. 30, 2021 USD ($) site marina community shares	Dec. 31, 2020 site	Dec. 31, 2020 shares	Dec. 31, 2020 USD ($)	Dec. 31, 2020 development_site	Dec. 31, 2020 segment	Oct. 31, 2020 shares	Sep. 30, 2020 shares
Business Acquisition [Line Items]
Development Sites | development_site							109
Number of marinas owned (in marinas)			2					99
Investment in property			$ 598,975,000			$ 2,339,368,000
Inventory of manufactured homes, boat parts and retail related items			331,000			9,942,000
In-place leases, goodwill and other intangible assets			15,574,000			694,264,000
Other assets / (liabilities), net			(12,053,000)			42,231,000
Total identifiable assets acquired net of liabilities assumed			602,827,000			3,001,343,000
Cash and escrow		$ 1,923,855,000	578,827,000
Debt assumed						837,800,000
Temporary and permanent equity		239,688,000	24,000,000
Total consideration		3,001,343,000	$ 602,827,000
Sites, Wet Slips and Dry Storage Spaces | site			4,469	45,800
Safe Harbor Wickford Cove
Business Acquisition [Line Items]
Investment in property						3,468,000
Inventory of manufactured homes, boat parts and retail related items						0
In-place leases, goodwill and other intangible assets						42,000
Total identifiable assets acquired net of liabilities assumed						3,389,000
Cash and escrow		3,389,000
Temporary and permanent equity		0
Total consideration		3,389,000
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Liabilities, Goodwill And Other Intangible Assets						(121,000)
Sites, Wet Slips and Dry Storage Spaces | site				60
Safe Harbor Rockland
Business Acquisition [Line Items]
Investment in property						15,082,000
Inventory of manufactured homes, boat parts and retail related items						348,000
In-place leases, goodwill and other intangible assets						101,000
Other assets / (liabilities), net						368,000
Total identifiable assets acquired net of liabilities assumed						15,163,000
Cash and escrow		15,163,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		15,163,000
Sites, Wet Slips and Dry Storage Spaces | site				173
Safe Harbor Mears Annapolis
Business Acquisition [Line Items]
Investment in property						24,354,000
Inventory of manufactured homes, boat parts and retail related items						0
In-place leases, goodwill and other intangible assets						6,922,000
Other assets / (liabilities), net						546,000
Total identifiable assets acquired net of liabilities assumed						30,730,000
Cash and escrow		30,730,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		30,730,000
Sites, Wet Slips and Dry Storage Spaces | site				184
Series E Preferred OP Units
Business Acquisition [Line Items]
Shares outstanding (in shares) | shares			90,000		90,000
Series A-4 Preferred Stock, Shares Issued | shares			90,000
Series F Preferred OP Units
Business Acquisition [Line Items]
Shares outstanding (in shares) | shares			90,000		90,000
Series A-4 Preferred Stock, Shares Issued | shares	90,000
Series G Preferred OP Units
Business Acquisition [Line Items]
Series A-4 Preferred Stock, Shares Issued | shares			240,710		240,710					260,710
Series H Preferred OP Units
Business Acquisition [Line Items]
Shares outstanding (in shares) | shares					581,407
Series A-4 Preferred Stock, Shares Issued | shares			581,407						581,407
Series I Preferred OP Units
Business Acquisition [Line Items]
Shares outstanding (in shares) | shares			922,000
Series A-4 Preferred Stock, Shares Issued | shares					922,000
Cape Cod
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						13,350,000
Inventory of manufactured homes, boat parts and retail related items						0
In-place leases, goodwill and other intangible assets						150,000
Other assets / (liabilities), net						295,000
Total identifiable assets acquired net of liabilities assumed						13,205,000
Cash and escrow		4,205,000
Debt assumed						0
Temporary and permanent equity		9,000,000
Total consideration		13,205,000
Sites, Wet Slips and Dry Storage Spaces | site				230
Blue Water Beach Resort
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						11,364,000
Inventory of manufactured homes, boat parts and retail related items						0
In-place leases, goodwill and other intangible assets						80,000
Other assets / (liabilities), net						391,000
Total identifiable assets acquired net of liabilities assumed						11,053,000
Cash and escrow		11,053,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		11,053,000
Sites, Wet Slips and Dry Storage Spaces | site				299
Forest Springs
Business Acquisition [Line Items]
Development Sites				372			0
Investment in property						51,949,000
Inventory of manufactured homes, boat parts and retail related items						1,337,000
In-place leases, goodwill and other intangible assets						2,160,000
Other assets / (liabilities), net						107,000
Total identifiable assets acquired net of liabilities assumed						55,339,000
Cash and escrow		36,260,000
Debt assumed						0
Temporary and permanent equity		19,079,000
Total consideration		55,339,000
Forest Springs | Common OP Units
Business Acquisition [Line Items]
Equity interest issued or issuable, number of shares (in shares) | shares	82,420
Cherrystone Family Camping Resort
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						16,792,000
Inventory of manufactured homes, boat parts and retail related items						0
In-place leases, goodwill and other intangible assets						0
Other assets / (liabilities), net						230,000
Total identifiable assets acquired net of liabilities assumed						16,562,000
Cash and escrow		16,562,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		16,562,000
Sites, Wet Slips and Dry Storage Spaces | site				123
Beachwood Resort
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						34,000,000
Inventory of manufactured homes, boat parts and retail related items						0
In-place leases, goodwill and other intangible assets						0
Other assets / (liabilities), net						155,000
Total identifiable assets acquired net of liabilities assumed						33,845,000
Cash and escrow		33,845,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		33,845,000
Sites, Wet Slips and Dry Storage Spaces | site				421
Woodsmoke [Member]
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						25,120,000
Inventory of manufactured homes, boat parts and retail related items						40,000
In-place leases, goodwill and other intangible assets						840,000
Other assets / (liabilities), net						461,000
Total identifiable assets acquired net of liabilities assumed						25,539,000
Cash and escrow		25,539,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		25,539,000
Sites, Wet Slips and Dry Storage Spaces | site				300
Jellystone Lone Star [Member]
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						21,000,000
Inventory of manufactured homes, boat parts and retail related items						0
In-place leases, goodwill and other intangible assets						0
Other assets / (liabilities), net						703,000
Total identifiable assets acquired net of liabilities assumed						20,297,000
Cash and escrow		20,297,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		20,297,000
Sites, Wet Slips and Dry Storage Spaces | site				344
El Capitan & Ocean Mesa [Member]
Business Acquisition [Line Items]
Development Sites | development_site							109
Number of communities impaired | community			2
Investment in property			$ 37,647,000			69,690,000
Inventory of manufactured homes, boat parts and retail related items			0			0
In-place leases, goodwill and other intangible assets			10,073,000			0
Other assets / (liabilities), net			(703,000)			10,321,000
Total identifiable assets acquired net of liabilities assumed			47,017,000			59,369,000
Cash and escrow		32,108,000	47,017,000
Debt assumed						0
Temporary and permanent equity		27,261,000	0
Total consideration		59,369,000	$ 47,017,000
Sites, Wet Slips and Dry Storage Spaces | site				266
Highland Green Estates & Troy Villa [Member]
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						60,988,000
Inventory of manufactured homes, boat parts and retail related items						1,679,000
In-place leases, goodwill and other intangible assets						2,030,000
Other assets / (liabilities), net						15,000
Total identifiable assets acquired net of liabilities assumed						64,682,000
Cash and escrow		64,682,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		64,682,000
Sites, Wet Slips and Dry Storage Spaces | site				1,162
Associate Island KOA
Business Acquisition [Line Items]
Sites, Wet Slips and Dry Storage Spaces | site			294
Blue Water
Business Acquisition [Line Items]
Investment in property			$ 9,000,000
Inventory of manufactured homes, boat parts and retail related items			0
In-place leases, goodwill and other intangible assets			0
Other assets / (liabilities), net			(151,000)
Total identifiable assets acquired net of liabilities assumed			8,849,000
Cash and escrow			8,849,000
Temporary and permanent equity			0
Total consideration			$ 8,849,000
Sites, Wet Slips and Dry Storage Spaces | site			177
Tranquility MHC
Business Acquisition [Line Items]
Investment in property			$ 1,250,000
Inventory of manufactured homes, boat parts and retail related items			0
In-place leases, goodwill and other intangible assets			0
Other assets / (liabilities), net			(1,000)
Total identifiable assets acquired net of liabilities assumed			1,249,000
Cash and escrow			1,249,000
Temporary and permanent equity			0
Total consideration			$ 1,249,000
Sites, Wet Slips and Dry Storage Spaces | site			25
Pleasant Beach Campground
Business Acquisition [Line Items]
Investment in property			$ 1,531,000
Inventory of manufactured homes, boat parts and retail related items			0
In-place leases, goodwill and other intangible assets			57,000
Other assets / (liabilities), net			1,000
Total identifiable assets acquired net of liabilities assumed			1,589,000
Cash and escrow			1,589,000
Temporary and permanent equity			0
Total consideration			$ 1,589,000
Sites, Wet Slips and Dry Storage Spaces | site			102
Cherrystone Family Camping
Business Acquisition [Line Items]
Investment in property			$ 59,669,000
Inventory of manufactured homes, boat parts and retail related items			0
In-place leases, goodwill and other intangible assets			231,000
Other assets / (liabilities), net			(2,029,000)
Total identifiable assets acquired net of liabilities assumed			57,871,000
Cash and escrow			57,871,000
Temporary and permanent equity			0
Total consideration			$ 57,871,000
Sites, Wet Slips and Dry Storage Spaces | site			669
Beachwood
Business Acquisition [Line Items]
Investment in property			$ 14,004,000
Inventory of manufactured homes, boat parts and retail related items			0
In-place leases, goodwill and other intangible assets			211,000
Other assets / (liabilities), net			(7,616,000)
Total identifiable assets acquired net of liabilities assumed			6,599,000
Cash and escrow			6,599,000
Temporary and permanent equity			0
Total consideration			$ 6,599,000
Sites, Wet Slips and Dry Storage Spaces | site			672
Safe Harbor Marinas
Business Acquisition [Line Items]
Development Sites | development_site							0
In-place leases, goodwill and other intangible assets						5,700,000
Other assets / (liabilities), net						26,831,000
Total identifiable assets acquired net of liabilities assumed						2,040,781,000
Debt assumed						829,000,000
Business Combination, Considered Transferred, Deferred Payment		2,040,781,000
Asset Acquisition, Payments to Acquire Businesses, Gross		1,141,797,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill And Other Intangibles						418,033,000
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment						1,643,879,000
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Liabilities, Goodwill And Other Intangible Assets						69,984,000
Sites, Wet Slips and Dry Storage Spaces | site				37,305
Islamorada and Angler House
Business Acquisition [Line Items]
Total identifiable assets acquired net of liabilities assumed			$ 17,975,000
Temporary and permanent equity			0
Total consideration			$ 17,975,000
Sites, Wet Slips and Dry Storage Spaces | site			251
Gig Harbor
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						15,250,000
Inventory of manufactured homes, boat parts and retail related items						0
In-place leases, goodwill and other intangible assets						0
Other assets / (liabilities), net						22,000
Total identifiable assets acquired net of liabilities assumed						15,228,000
Cash and escrow		15,228,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		$ 15,228,000
Sites, Wet Slips and Dry Storage Spaces | site				115
Maine MH Portfolio
Business Acquisition [Line Items]
Development Sites | development_site							0
Number of communities impaired | community		6	6
Investment in property						79,890,000
In-place leases, goodwill and other intangible assets						0
Other assets / (liabilities), net						30,000
Total identifiable assets acquired net of liabilities assumed						81,279,000
Cash and escrow		$ 72,479,000
Temporary and permanent equity		0
Total consideration		81,279,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 1,359,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt						8,800,000
Sites, Wet Slips and Dry Storage Spaces | site				1,083
Mouse Mountain
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						15,221,000
In-place leases, goodwill and other intangible assets						0
Other assets / (liabilities), net						(4,000)
Total identifiable assets acquired net of liabilities assumed						15,496,000
Cash and escrow		15,496,000
Temporary and permanent equity		0
Total consideration		15,496,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						279,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt						0
Sites, Wet Slips and Dry Storage Spaces | site				304
Lakeview Mobile Estates
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						22,917,000
In-place leases, goodwill and other intangible assets						195,000
Other assets / (liabilities), net						(72,000)
Total identifiable assets acquired net of liabilities assumed						23,678,000
Cash and escrow		23,678,000
Temporary and permanent equity		0
Total consideration		23,678,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						638,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt						0
Sites, Wet Slips and Dry Storage Spaces | site				296
Shenandoah Acres
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						16,166,000
Inventory of manufactured homes, boat parts and retail related items						0
In-place leases, goodwill and other intangible assets						834,000
Other assets / (liabilities), net						197,000
Total identifiable assets acquired net of liabilities assumed						16,803,000
Cash and escrow		16,803,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		16,803,000
Sites, Wet Slips and Dry Storage Spaces | site				522
Jellystone at Barton Lake
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						23,462,000
Inventory of manufactured homes, boat parts and retail related items						0
In-place leases, goodwill and other intangible assets						538,000
Other assets / (liabilities), net						397,000
Total identifiable assets acquired net of liabilities assumed						23,603,000
Cash and escrow		23,603,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		23,603,000
Sites, Wet Slips and Dry Storage Spaces | site				555
Kittatinny Portfolio
Business Acquisition [Line Items]
Development Sites | development_site							0
Investment in property						16,220,000
Inventory of manufactured homes, boat parts and retail related items						0
In-place leases, goodwill and other intangible assets						30,000
Other assets / (liabilities), net						(29,000)
Total identifiable assets acquired net of liabilities assumed						16,279,000
Cash and escrow		16,279,000
Debt assumed						0
Temporary and permanent equity		0
Total consideration		16,279,000
Sites, Wet Slips and Dry Storage Spaces | site				527
Safe Harbor Hideaway Bay
Business Acquisition [Line Items]
Development Sites | development_site							0
In-place leases, goodwill and other intangible assets						23,000
Other assets / (liabilities), net						1,077,000
Total identifiable assets acquired net of liabilities assumed						32,406,000
Debt assumed						0
Business Combination, Considered Transferred, Deferred Payment		32,406,000
Asset Acquisition, Payments to Acquire Businesses, Gross		32,406,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill And Other Intangibles						7,242,000
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment						26,218,000
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Liabilities, Goodwill And Other Intangible Assets						0
Sites, Wet Slips and Dry Storage Spaces | site				628
Safe Harbor Anacapa Isle
Business Acquisition [Line Items]
Development Sites | development_site							0
In-place leases, goodwill and other intangible assets						0
Other assets / (liabilities), net						(60,000)
Total identifiable assets acquired net of liabilities assumed						14,130,000
Debt assumed						0
Business Combination, Considered Transferred, Deferred Payment		14,130,000
Asset Acquisition, Payments to Acquire Businesses, Gross		14,130,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill And Other Intangibles						3,146,000
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment						10,924,000
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Liabilities, Goodwill And Other Intangible Assets						0
Sites, Wet Slips and Dry Storage Spaces | site				453
Safe Harbor Rybovich Portfolio
Business Acquisition [Line Items]
Development Sites | development_site							0
Number of marinas owned (in marinas) | marina			2
In-place leases, goodwill and other intangible assets						620,000
Other assets / (liabilities), net						37,000
Total identifiable assets acquired net of liabilities assumed						372,487,000
Debt assumed						0
Business Combination, Considered Transferred, Deferred Payment		372,487,000
Asset Acquisition, Payments to Acquire Businesses, Gross		$ 258,123,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill And Other Intangibles						249,840,000
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment						122,064,000
Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Liabilities, Goodwill And Other Intangible Assets						$ 114,364,000
Sites, Wet Slips and Dry Storage Spaces | site				78
Prime Martha's Vineyard
Business Acquisition [Line Items]
Total identifiable assets acquired net of liabilities assumed			$ 21,950,000
Temporary and permanent equity			0
Total consideration			$ 21,950,000
Sites, Wet Slips and Dry Storage Spaces | site			390
Safe Harbor Wickford Cove
Business Acquisition [Line Items]
Development Sites | development_site							0
Safe Harbor Rockland
Business Acquisition [Line Items]
Development Sites | development_site							0
Safe Harbor Mears Annapolis
Business Acquisition [Line Items]
Development Sites | development_site							0
Themeworld RV
Business Acquisition [Line Items]
Investment in property			$ 25,000,000
Inventory of manufactured homes, boat parts and retail related items			0
In-place leases, goodwill and other intangible assets			0
Other assets / (liabilities), net			(104,000)
Total identifiable assets acquired net of liabilities assumed			24,896,000
Cash and escrow			24,896,000
Temporary and permanent equity			0
Total consideration			$ 24,896,000
Sites, Wet Slips and Dry Storage Spaces | site			148
Sylvan Glen Estates
Business Acquisition [Line Items]
Investment in property			$ 23,469,000
Inventory of manufactured homes, boat parts and retail related items			20,000
In-place leases, goodwill and other intangible assets			531,000
Other assets / (liabilities), net			(269,000)
Total identifiable assets acquired net of liabilities assumed			23,751,000
Cash and escrow			(249,000)
Temporary and permanent equity			24,000,000
Total consideration			$ 23,751,000
Sites, Wet Slips and Dry Storage Spaces | site			476
Shelter Island
Business Acquisition [Line Items]
Investment in property			$ 9,520,000
Inventory of manufactured homes, boat parts and retail related items			132,000
In-place leases, goodwill and other intangible assets			402,000
Other assets / (liabilities), net			(85,000)
Total identifiable assets acquired net of liabilities assumed			9,969,000
Cash and escrow			9,969,000
Temporary and permanent equity			0
Total consideration			$ 9,969,000
Sites, Wet Slips and Dry Storage Spaces | site			55
Lauderdale Marine Center
Business Acquisition [Line Items]
Investment in property			$ 336,992,000
Inventory of manufactured homes, boat parts and retail related items			0
In-place leases, goodwill and other intangible assets			3,282,000
Other assets / (liabilities), net			958,000
Total identifiable assets acquired net of liabilities assumed			341,232,000
Cash and escrow			341,232,000
Temporary and permanent equity			0
Total consideration			$ 341,232,000
Sites, Wet Slips and Dry Storage Spaces | site			202
Apponaug Harbor
Business Acquisition [Line Items]
Investment in property			$ 6,540,000
Inventory of manufactured homes, boat parts and retail related items			0
In-place leases, goodwill and other intangible assets			89,000
Other assets / (liabilities), net			(689,000)
Total identifiable assets acquired net of liabilities assumed			5,940,000
Cash and escrow			5,940,000
Temporary and permanent equity			0
Total consideration			$ 5,940,000
Sites, Wet Slips and Dry Storage Spaces | site			378
Cabrillo Isle
Business Acquisition [Line Items]
Sites, Wet Slips and Dry Storage Spaces | site			483
Marathon Marina
Business Acquisition [Line Items]
Investment in property			$ 19,129,000
Inventory of manufactured homes, boat parts and retail related items			19,000
In-place leases, goodwill and other intangible assets			261,000
Other assets / (liabilities), net			(227,000)
Total identifiable assets acquired net of liabilities assumed			19,182,000
Cash and escrow			19,182,000
Temporary and permanent equity			0
Total consideration			$ 19,182,000
Sites, Wet Slips and Dry Storage Spaces | site			147