Equity and Temporary Equity, Narrative (Details) $ / shares in Units, $ in Thousands					1 Months Ended										2 Months Ended	3 Months Ended				6 Months Ended		15 Months Ended
	Oct. 05, 2021 USD ($)	Jun. 04, 2021 USD ($)	Apr. 05, 2021 $ / shares shares	Mar. 02, 2021 USD ($) $ / shares shares	Apr. 30, 2021 $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Oct. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2020 $ / shares shares	May 31, 2020 USD ($) shares	Feb. 28, 2020	Jan. 31, 2020	Aug. 31, 2019 USD ($)	Feb. 28, 2019 $ / shares Rate shares	Jun. 30, 2018 USD ($)	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2021 USD ($) $ / shares Rate shares	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 shares	Sep. 30, 2018 USD ($)	Oct. 01, 2020 salesAgreement
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction			200,000,000	8,050,000				9,200,000	4,968,000
Sale of Stock, Price Per Share | $ / shares				$ 140.00											$ 139.50	$ 139.50				$ 139.50
Proceeds from Issuance of Common Stock | $				$ 537,600					$ 633,100						$ 539,700
Variable Interest Entity, Equity Interests Issued | $												$ 2,400
Issuance of common stock and common OP units, net | $				$ 1,100,000																		$ 163,800
Aggregate Value of Shares to be Issued in Accordance to Sales Agreement | $		$ 500,000
Commission, Maximum Percentage of Gross Sales Price Per Share According to Sales Agreement		2.00%
Temporary Equity, Dividends For Term Two, Percentage									3.00%
Sale of Stock, Number of Shares Issued in Transaction, Direct				4,000,000
Sale of Stock, Number of Shares Issued in Transaction, Forward Equity Sales				4,050,000
Common Stock, Par Value | $ / shares			$ 0.01			$ 0.01									$ 0.01	$ 0.01				$ 0.01
Preferred Stock, Par or Stated Value Per Share | $ / shares			$ 0.01
Common Stock, Shares Issued						107,626,000									115,889,000	115,889,000				115,889,000
Common Stock, Shares Outstanding						107,626,000									115,889,000	115,889,000				115,889,000
Number Of Forward Sales Agreements | salesAgreement																							2
Shares Issued Under New Sales Agreement																				0
Share Issuance Prior To New Sales Agreement																				0
Series E Preferred OP Units
Class of Stock [Line Items]
Temporary Equity, Dividends For Term One, Percentage																5.25%
Series A-4 Preferred Stock, Shares Issued															90,000	90,000				90,000
Temporary Equity, Issuance Price | $ / shares																$ 100.00
Temporary Equity, Dividends For Term Two, Percentage | Rate																5.50%
Shares outstanding (in shares)						90,000									90,000	90,000				90,000
Series E Preferred OP Units | Maximum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion											145.00
Series E Preferred OP Units | Minimum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion											100.00
Series D Preferred OP Units
Class of Stock [Line Items]
Temporary Equity, Dividends For Term One, Percentage													3.75%
Series A-4 Preferred Stock, Shares Issued													488,958
Temporary Equity, Issuance Price | $ / shares													$ 100.00
Temporary Equity, Dividends For Term Two, Percentage | Rate													4.00%
Shares outstanding (in shares)															488,958	488,958				488,958
Series D Preferred OP Units | Maximum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion										160.00			125.00
Series D Preferred OP Units | Minimum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion													100.00
Common Stock
Class of Stock [Line Items]
Dividends per common share | $ / shares																				$ 0.83
Payments of dividends | $																				$ 98,320
Series F Preferred OP Units
Class of Stock [Line Items]
Series A-4 Preferred Stock, Shares Issued									90,000
Temporary Equity, Issuance Price | $ / shares								$ 100.00
Shares outstanding (in shares)						90,000									90,000	90,000				90,000
Series F Preferred OP Units | Minimum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion										100.00
Series G Preferred OP Units
Class of Stock [Line Items]
Temporary Equity, Dividends For Term One, Percentage								3.20%
Series A-4 Preferred Stock, Shares Issued						240,710		260,710							240,710	240,710				240,710
Series G Preferred OP Units | Maximum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion											155.00
Series G Preferred OP Units | Minimum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion											100.00
Series H Preferred OP Units
Class of Stock [Line Items]
Temporary Equity, Dividends For Term One, Percentage							3.00%
Series A-4 Preferred Stock, Shares Issued							581,407								581,407	581,407				581,407
Temporary Equity, Issuance Price | $ / shares							$ 100.00
Shares outstanding (in shares)						581,407
Series H Preferred OP Units | Maximum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion							164.00
Series H Preferred OP Units | Minimum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion							100.00
Series J Preferred Op Units
Class of Stock [Line Items]
Temporary Equity, Dividends For Term One, Percentage					2.85%
Series A-4 Preferred Stock, Shares Issued					240,000										240,000	240,000				240,000
Temporary Equity, Issuance Price | $ / shares					$ 100.00
Shares outstanding (in shares)															240,000	240,000				240,000
Series J Preferred Op Units | Maximum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion					165.00
Series J Preferred Op Units | Minimum [Member]
Class of Stock [Line Items]
Convertible Preferred Stock, Shares Issued Per Share Upon Conversion					100.00
Shelf Registration
Class of Stock [Line Items]
Common Stock, Shares Issued															115,889,185	115,889,185				115,889,185
Common Stock, Shares Outstanding															115,889,185	115,889,185				115,889,185
Preferred Stock, Shares Issued															0	0				0
Preferred Stock, Shares Outstanding															0	0				0
Common Stock
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction			180,000,000
Issuance of common stock and common OP units, net | $																$ 40	$ 42	$ 49	$ 1
Conversion of Common OP Units
Class of Stock [Line Items]
Conversion of Common OP Units to common stock (in shares)																				37,862	26,105
Conversion of Common OP Units | Common OP Units
Class of Stock [Line Items]
Conversion of Common OP Units to common stock (in shares)																				37,862	26,105
Series A-1 Preferred OP Units
Class of Stock [Line Items]
Conversion of Common OP Units to common stock (in shares)																				16,119	22,226
Series A-1 Preferred OP Units | Common OP Units
Class of Stock [Line Items]
Conversion of Common OP Units to common stock (in shares)																				6,610	9,114
Preferred Stock
Class of Stock [Line Items]
Sale of Stock, Number of Shares Issued in Transaction			20,000,000
NG Sun LLC [Member] | Sun NG RV Resorts [Member]
Class of Stock [Line Items]
Variable Interest Entity, Equity Interests Issued, Floating Rate																				5.00%
NG Sun LLC [Member] | Common Stock | Sun NG RV Resorts [Member]
Class of Stock [Line Items]
Variable Interest Entity, Equity Interests Issued | $														$ 6,500
Sun NG RV Resorts [Member] | Common Stock
Class of Stock [Line Items]
Variable Interest Entity, Equity Interests Issued | $														3,000
Sun NG RV Resorts [Member] | Common Stock | Sun NG RV Resorts [Member]
Class of Stock [Line Items]
Variable Interest Entity, Equity Interests Issued | $														$ 15,400						$ 22,300
NG Sun Whitewater [Member]
Class of Stock [Line Items]
Variable Interest Entity, Equity Interest | $						$ 5,100									$ 5,100	5,100				5,100
Sun Menifee
Class of Stock [Line Items]
Payments to Acquire Limited Partnership Interests | $							$ 100
Noncontrolling Interest in Limited Partnerships | $															$ 100	$ 100				$ 100
Forecast
Class of Stock [Line Items]
Proceeds from Issuance of Common Stock | $	$ 1,230,000
Forest Springs | Common OP Units
Class of Stock [Line Items]
Equity interest issued or issuable, number of shares (in shares)									82,420
Safe Harbor Rybovich | Common OP Units
Class of Stock [Line Items]
Equity interest issued or issuable, number of shares (in shares)						130,475
Safe Harbor | Common OP Units
Class of Stock [Line Items]
Equity interest issued or issuable, number of shares (in shares)							55,403