Investment in and Advances in Real Estate Joint Ventures - Investment and Advances to Real Estate Joint Ventures - Balance Sheets (Details) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Subsidiary or Equity Method Investee [Line Items]
Total real estate, net		$ 16,810,333	$ 15,094,925
Other assets, net		578,569	241,948
Assets	[1]	20,309,896	18,274,022
Notes payable, net		7,964,738	7,262,851
Mortgages payable, net		496,438	353,945
Other Liabilities		597,456	599,961
Accumulated other comprehensive income		11,038	3,329
Noncontrolling interests		145,365	127,993
Members’ capital		10,652,547	9,525,465
Total Liabilities and Members’ Capital		20,309,896	18,274,022
Equity, Attributable to Noncontrolling Interest		145,365	127,993
KIR [Member]
Subsidiary or Equity Method Investee [Line Items]
Total real estate, net		659,300	669,200
Other assets, net		90,800	67,500
Assets		750,100	736,700
Notes payable, net		273,900	273,400
Other Liabilities		14,100	15,900
Accumulated other comprehensive income		4,200	600
Members’ capital		457,900	446,800
Total Liabilities and Members’ Capital		750,100	736,700
Excluding KIR [Member]
Subsidiary or Equity Method Investee [Line Items]
Total real estate, net		4,260,000	3,156,200
Other assets, net		231,400	251,600
Assets		4,491,400	3,407,800
Notes payable, net		309,200	159,900
Mortgages payable, net		890,600	815,600
Other Liabilities		119,400	70,900
Accumulated other comprehensive income		2,400	5,100
Noncontrolling interests		0	34,400
Members’ capital		3,169,800	2,321,900
Total Liabilities and Members’ Capital		4,491,400	3,407,800
Equity, Attributable to Noncontrolling Interest		$ 0	$ 34,400

[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at December 31, 2024 and 2023 of $334,859 and $388,626, respectively. See Footnote 17 of the Notes to Consolidated Financial Statements.