Other Assets and Liabilities (Accounts Payable and Accrued Expenses) (Details)	3 Months Ended	9 Months Ended
	Jun. 30, 2021 USD ($) a	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Feb. 28, 2021 USD ($)	Dec. 31, 2020 USD ($)
Other Assets and Liabilities [Line Items]
Condominium deposit liabilities		$ 550,619,000			$ 309,884,000
Condominium deposit liabilities, Change		240,735,000
Construction payables		312,767,000			253,626,000
Construction payables, Change		59,141,000
Deferred income		63,157,000			66,656,000
Deferred income, Change		(3,499,000)
Tenant and other deposits		38,016,000			25,801,000
Tenant and other deposits, Change		12,215,000
Accounts payable and accrued expenses		36,961,000			28,589,000
Accounts payable and accrued expenses, Change		8,372,000
Accrued real estate taxes		35,748,000			38,863,000
Accrued real estate taxes, Change		(3,115,000)
Interest rate swap liabilities		35,367,000			51,920,000
Interest rate swap liabilities, Change		(16,553,000)
Accrued payroll and other employee liabilities		25,794,000			27,419,000
Accrued payroll and other employee liabilities, Change		(1,625,000)
Accrued interest		22,972,000			37,007,000
Accrued interest, Change		(14,035,000)
Other		20,360,000			12,493,000
Other, Change		7,867,000
Accounts payable and accrued expenses		1,141,761,000			$ 852,258,000
Accounts payable and accrued expenses, Change		289,503,000
Senior Notes due 2025 | Senior Notes
Other Assets and Liabilities [Line Items]
Face amount		$ 1,000,000,000	$ 1,000,000,000
Interest Rate		5.375%	5.375%
Senior Notes due 2029 | Senior Notes
Other Assets and Liabilities [Line Items]
Face amount			$ 650,000,000	$ 650,000,000
Interest Rate		4.125%	4.125%	4.125%
Senior Notes due 2031 | Senior Notes
Other Assets and Liabilities [Line Items]
Face amount			$ 650,000,000	$ 650,000,000
Interest Rate		4.375%	4.375%	4.375%
Ward Village, the Tin Building, and the Summerlin and Bridgeland MPC developments
Other Assets and Liabilities [Line Items]
Construction payables, Change		$ 119,400,000
Waiea
Other Assets and Liabilities [Line Items]
Construction payables, Change		21,000,000
Various projects
Other Assets and Liabilities [Line Items]
Construction payables, Change		$ (60,300,000)
Summerlin
Other Assets and Liabilities [Line Items]
Deposit received	$ 13,500,000
Area of land sold | a	216