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Mortgage and Other Indebtedness - Additional Information (Details)			1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 17, 2021 $ / shares	Oct. 25, 2018 USD ($) extension	Mar. 31, 2021 USD ($) day $ / shares	Jun. 30, 2021 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Jun. 30, 2021 USD ($) extension $ / shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Principal				$ 1,299,557,000		$ 1,299,557,000		$ 1,176,076,000
Letters of credit outstanding, amount				1,200,000		1,200,000
Letters of credit outstanding, amount advanced				0		0
Value in unencumbered asset pool				1,400,000,000		1,400,000,000
Net proceeds from offering						175,000,000	$ 300,000,000
Purchase of capped calls					$ 9,800,000
Percentage bearing fixed interest, amount				1,000,000,000.0		1,000,000,000.0
Percentage bearing variable interest, amount				279,400,000		279,400,000
Three Fixed-Rate Secured Loans
Debt Instrument [Line Items]
Long-term debt, fair value				1,100,000,000		1,100,000,000
Variable rate debt
Debt Instrument [Line Items]
Long-term debt, fair value				279,000,000.0		279,000,000.0
Senior unsecured notes
Debt Instrument [Line Items]
Percentage bearing fixed interest, amount				550,000,000		550,000,000
Senior unsecured notes \| Fixed rate debt
Debt Instrument [Line Items]
Principal				$ 550,000,000		$ 550,000,000		550,000,000
Exchangeable senior notes - fixed rate \| Fixed rate debt
Debt Instrument [Line Items]
Interest rate				0.75%		0.75%
Principal				$ 175,000,000		$ 175,000,000
Principal amount of debt issued				175,000,000.0		175,000,000.0
Net proceeds from offering			$ 169,700,000
Interest expense				$ 500,000		$ 600,000
Conversion price (in USD per share) \| $ / shares				$ 25.21		$ 25.21
Exchange premium, percent of closing price			25.00%
Percentage of exchange price						130.00%
Trading days \| day			20
Consecutive trading days \| day			30
Percentage of redemption price			100.00%
Exchangeable conversion ratio			0.0396628
Exchangeable senior notes - fixed rate \| Capped Call
Debt Instrument [Line Items]
Exchange premium, percent of closing price			50.00%
Exchange price (in USD per share) \| $ / shares			$ 30.26
Purchase of capped calls						$ 9,800,000
Exchangeable senior notes - fixed rate \| Common Shares \| Fixed rate debt
Debt Instrument [Line Items]
Common stock closing price (in USD per share) \| $ / shares	$ 20.17
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 600,000,000		$ 600,000,000
Debt instrument, maturity date, number of extensions \| extension						1
Debt instrument, maturity date, extension						12 months
Line of credit facility, option to increase maximum borrowing capacity				1,200,000,000		$ 1,200,000,000
Principal				0		0		$ 25,000,000
Line of credit facility, remaining borrowing capacity				$ 422,100,000		$ 422,100,000
LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate						0.10%
Minimum \| Three Fixed-Rate Secured Loans
Debt Instrument [Line Items]
Interest rate				3.78%		3.78%
Percentage bearing fixed interest				2.77%		2.77%
Minimum \| Variable rate debt
Debt Instrument [Line Items]
Percentage bearing variable interest				2.72%		2.72%
Maximum \| Three Fixed-Rate Secured Loans
Debt Instrument [Line Items]
Interest rate				5.73%		5.73%
Percentage bearing fixed interest				3.80%		3.80%
Maximum \| Variable rate debt
Debt Instrument [Line Items]
Percentage bearing variable interest				3.60%		3.60%
Maximum \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate						160.00%
KRG, LP
Debt Instrument [Line Items]
Net proceeds from offering						$ 175,000,000	$ 300,000,000
Purchase of capped calls					$ 9,800,000
KRG, LP \| Unsecured term loan \| Term Loan Due October 2025
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 250,000,000
Debt instrument, maturity date, number of extensions \| extension		3
Debt instrument, maturity date, extension		1 year
Line of credit facility, option to increase maximum borrowing capacity		$ 300,000,000