Corporate Indebtedness - Junior Subordinated Deferrable Interest Debentures and Principal Maturities (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2005 USD ($)	Dec. 31, 2025 USD ($) quarter
Principal Repayments and Joint Venture Debt
2026		$ 655,148
2027		2,569,277
2028		284,550
2029		177,000
2030		0
Thereafter		358,524
Repayments of principal		$ 4,044,499
Trust Preferred Securities
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 100,000
Interest rate added to base rate (as a percent)		0.26%
Interest payment deferment, number of consecutive quarters | quarter		8
Due from joint ventures
Principal Repayments and Joint Venture Debt
2026		$ 1,080,248
2027		1,749,857
2028		576,793
2029		0
2030		840,000
Thereafter		1,650,300
Repayments of principal		5,897,198
Due from joint ventures | Mortgages and other loans payable
Principal Repayments and Joint Venture Debt
2026		555,148
2027		879,277
2028		284,550
2029		177,000
2030		0
Thereafter		258,524
Repayments of principal		2,154,499
Due from joint ventures | Revolving Credit Facility
Principal Repayments and Joint Venture Debt
2026		0
2027		640,000
2028		0
2029		0
2030		0
Thereafter		0
Repayments of principal		640,000
Due from joint ventures | Unsecured Term Loans
Principal Repayments and Joint Venture Debt
2026		100,000
2027		1,050,000
2028		0
2029		0
2030		0
Thereafter		0
Repayments of principal		1,150,000
Due from joint ventures | Trust Preferred Securities
Principal Repayments and Joint Venture Debt
2026		0
2027		0
2028		0
2029		0
2030		0
Thereafter		100,000
Repayments of principal		$ 100,000