Segments (Summary of Segment Operating Results) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segments reporting
Total revenues	$ 268,659	$ 639,549	$ 688,264	$ 1,126,483
Depreciation and amortization	(55,974)	(50,015)	(161,204)	(147,584)
Other income (loss), net	173	2,004	3,547	2,497
Equity in earnings (losses) from unconsolidated ventures	(30,886)	7,708	(41,874)	19,528
Gain (loss) on sale or disposal of real estate and other assets, net	16,286	0	21,000	4,009
Gain (loss) on extinguishment of debt	(48)	0	(48)	(645)
Provision for impairment	(672,492)	0	(672,492)	0
Income (loss) before income taxes	(688,688)	141,527	(747,104)	173,094
Net income (loss)	(543,987)	107,669	(585,755)	131,272
Net (income) loss attributable to noncontrolling interests	(46)	427	(166)	510
Net income (loss) attributable to HHH	(544,033)	108,096	(585,921)	131,782
Operating segments
Segments reporting
Total revenues	268,644	639,535	688,219	1,126,440
Total operating expenses	(159,948)	(411,968)	(416,409)	(683,645)
Segment operating income (loss)	108,696	227,567	271,810	442,795
Depreciation and amortization	(55,000)	(48,875)	(158,605)	(144,706)
Interest income (expense), net	(10,083)	(2,300)	(26,304)	(13,742)
Other income (loss), net	150	1,303	766	1,616
Equity in earnings (losses) from unconsolidated ventures	(30,886)	7,708	(41,874)	19,528
Gain (loss) on sale or disposal of real estate and other assets, net	16,286		21,000	4,009
Gain (loss) on extinguishment of debt	(48)		(48)	(645)
Provision for impairment	(672,492)		(672,492)
Income (loss) before income taxes	(643,377)	185,403	(605,747)	308,855
Corporate
Segments reporting
Corporate income, expenses, and other items	99,390	(77,734)	19,992	(177,583)
Operating Assets Segment
Segments reporting
Total revenues	116,874	109,493	339,226	327,742
Operating Assets Segment | Operating segments
Segments reporting
Total revenues	116,874	109,493	339,226	327,742
Total operating expenses	(55,786)	(48,994)	(157,837)	(146,958)
Segment operating income (loss)	61,088	60,499	181,389	180,784
Depreciation and amortization	(43,127)	(37,714)	(123,637)	(115,143)
Interest income (expense), net	(31,884)	(23,340)	(91,080)	(64,776)
Other income (loss), net	(244)	421	1,998	(57)
Equity in earnings (losses) from unconsolidated ventures	1,364	4,132	5,311	21,898
Gain (loss) on sale or disposal of real estate and other assets, net	16,050		20,764	4,018
Gain (loss) on extinguishment of debt	0		0	(645)
Provision for impairment	0		0
Income (loss) before income taxes	3,247	3,998	(5,255)	26,079
MPC Segment
Segments reporting
Total revenues	95,799	78,188	236,123	266,990
MPC Segment | Operating segments
Segments reporting
Total revenues	95,799	78,188	236,123	266,990
Total operating expenses	(41,239)	(31,055)	(103,668)	(113,087)
Segment operating income (loss)	54,560	47,133	132,455	153,903
Depreciation and amortization	(103)	(104)	(316)	(286)
Interest income (expense), net	16,031	13,492	49,004	35,697
Other income (loss), net	0	0	(103)	23
Equity in earnings (losses) from unconsolidated ventures	14,310	14,862	21,056	16,990
Gain (loss) on sale or disposal of real estate and other assets, net	0		0	0
Gain (loss) on extinguishment of debt	0		0	0
Provision for impairment	0		0
Income (loss) before income taxes	84,798	75,383	202,096	206,327
Seaport Segment
Segments reporting
Total revenues	29,490	32,501	64,191	70,053
Seaport Segment | Operating segments
Segments reporting
Total revenues	29,490	32,501	64,191	70,053
Total operating expenses	(33,303)	(31,404)	(78,884)	(79,329)
Segment operating income (loss)	(3,813)	1,097	(14,693)	(9,276)
Depreciation and amortization	(10,808)	(9,651)	(31,804)	(25,194)
Interest income (expense), net	1,358	1,731	3,855	3,003
Other income (loss), net	313	(18)	(1,287)	289
Equity in earnings (losses) from unconsolidated ventures	(46,619)	(11,273)	(68,335)	(20,223)
Gain (loss) on sale or disposal of real estate and other assets, net	0		0	0
Gain (loss) on extinguishment of debt	(48)		(48)	0
Provision for impairment	(672,492)		(672,492)
Income (loss) before income taxes	(732,109)	(18,114)	(784,804)	(51,401)
Strategic Developments Segment
Segments reporting
Total revenues	26,481	419,353	48,679	461,655
Strategic Developments Segment | Operating segments
Segments reporting
Total revenues	26,481	419,353	48,679	461,655
Total operating expenses	(29,620)	(300,515)	(76,020)	(344,271)
Segment operating income (loss)	(3,139)	118,838	(27,341)	117,384
Depreciation and amortization	(962)	(1,406)	(2,848)	(4,083)
Interest income (expense), net	4,412	5,817	11,917	12,334
Other income (loss), net	81	900	158	1,361
Equity in earnings (losses) from unconsolidated ventures	59	(13)	94	863
Gain (loss) on sale or disposal of real estate and other assets, net	236		236	(9)
Gain (loss) on extinguishment of debt	0		0	0
Provision for impairment	0		0
Income (loss) before income taxes	$ 687	$ 124,136	$ (17,784)	$ 127,850