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Mortgages, Notes and Loans Payable, Net (Summary of Mortgages, Notes and Loans Payable) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021	Feb. 28, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Mortgages, notes and loans payable	$ 1,397,881			$ 1,945,344
Unamortized bond discounts	0			(4,355)
Unamortized deferred financing costs	(45,078)			(28,442)
Total mortgages, notes and loans payable, net	4,423,635			4,287,369
Secured mortgages, notes and loans payable
Debt Instrument [Line Items]
Fixed-rate debt	$ 676,210			590,517
Special Improvement District bonds
Debt Instrument [Line Items]
Interest Rate	4.00%
Fixed-rate debt	$ 69,622			34,305
Senior Notes due 2025 \| Senior Notes
Debt Instrument [Line Items]
Interest Rate	5.375%	5.375%
Fixed-rate debt	$ 0			1,000,000
Senior Notes due 2028 \| Senior Notes
Debt Instrument [Line Items]
Interest Rate	5.375%
Fixed-rate debt	$ 750,000			750,000
Senior Notes due 2029 \| Senior Notes
Debt Instrument [Line Items]
Interest Rate	4.125%	4.125%	4.125%
Fixed-rate debt	$ 650,000			0
Senior Notes due 2031 \| Senior Notes
Debt Instrument [Line Items]
Interest Rate	4.375%	4.375%	4.375%
Fixed-rate debt	$ 650,000			0
Secured Bridgeland Notes due 2026 \| Secured mortgages, notes and loans payable
Debt Instrument [Line Items]
Mortgages, notes and loans payable	$ 275,000			$ 0